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Archive for the ‘Climate Change’ Category

Is Global Warming a Hoax?

Tue ,10/05/2011

Sen. James Inhofe (R –OK) is famous for his statement, “Global warming is a hoax”. The local Tulsa newspaper often carries letters giving the opposing viewpoint. For example, Corey Cohen, recently wrote, “Sen. Inhofe, please cease your effort to stop EPA’s ability to limit greenhouse gas emissions. The science of global warming and climate change is obvious and known. For example, excessive CO2 in the atmosphere absorbs heat reflected from the ground and traps that heat in the atmosphere, melting glaciers and ice and snow packs all around the planet. A given molecule of CO2 in the atmosphere has a life of approximately 100 years. The implications are fairly obvious: rising sea levels, loss of fresh water for humans and unpredictable growing seasons for Oklahoma farmers and their winter wheat crops due to atmospheric heating.” (1)

Mr. Jack Williams replied (2) by “pointing out a few facts”  to defend Senator Inhofe’s position:

“1. More than 31,000 scientists signed a petition opposing the concept of man-made global warming.

2. More than 100 top climate scientists have expressed their opposition.

3. A dozen recognized scientists from nine countries who initially were global-warming proponents have changed their opinion and now oppose it in light of recently published information.

4. Earth has undergone many cooling and warming periods during its history.

5. Carbon dioxide constitutes less than 0.1 percent of the atmosphere while water vapor, at least as effective a greenhouse gas as CO2, ranges from about 20 to 100 times its concentration, and is quite variable.

6. There has been no measurable increase in global temperatures during the past decade.

7. The polar bear population dramatically increased during the past decade, as has ice thickness on Antarctica.”

It’s always nice to get alleged facts in a numbered list, where it is possible to check them one by one.

Endorsements: Facts one, two and three, fall into  the category of endorsements, and as with many endorsement, it is not always clear how well qualified those who endorse the position are, or whether the numbers listed are significant. There are about 23 million graduates with degrees in science and engineering. If 31,000 scientists signed the Oregon Petition, that is about 0.13% of those – hardly significant. Even then, the petition appears to be a hoax. In 1989, the Petition was mailed to thousands of Bachelor of Science students. It was formatted to appear as if it came from the National Academy of Science, but the organization quickly responded that the information was misleading and “the petition does not reflect the conclusions of expert reports of the Academy.”  The mailing collected 17,000 signatures and 14,000 have been added since. Most anyone could sign it, many who signed were misled, and many were not scientists at all, as it is possible to get BS degrees in fields such as journalism, sociology, education, philosophy… (3)

Endorsements that matter: All the major scientific organizations in the world have endorsed a statement such as that of the American Chemical Society,  ”Careful and comprehensive scientific assessments have clearly demonstrated that the Earth’s climate system is changing rapidly in response to growing atmospheric burdens of greenhouse gases and absorbing aerosol particles. There is very little room for doubt that observed climate trends are due to human activities. The threats are serious and action is urgently needed to mitigate the risks of climate change.” (4) A recent CNN poll found that 97% of scientists who are actively engaged in research in climate science agree that global warming is caused by man. (5) There is clearly a consensus among scientists on the matter and those making policy would be wise to heed it.

Warming and Cooling: Point four is a fact, but it is not relevant to what is happening today. The Earth has in the past had many natural warming and cooling periods but the current warming trend is not part of those. In the  past, ice ages and warmer interglacial periods have occurred in roughly 100,000-year cycles. These are attributed to the Milankovitch cycles. These cycles are small variations in the eccentricity, axial tilt, and precession of the Earth’s orbit that cause the amount of sunlight the Earth receives to increase and decrease in predictable cycles The cycles predict that a slow cooling trend, which began some 6,000 years ago, will continue for the next 23,000 years. The current warming trend is too rapid and in the wrong direction for the Milankovitch Cycles to be the cause. (6)

Greenhouse gases: Point five is also a fact, but it incorrectly downplays the role of  CO2  in determining the Earth’s temperature. In 1956, G.N. Plass calculated (7) that doubling the concentration of CO2 in the air would cause a 3 to 4 C increase in the Earth’s temperature. Many dismissed his work, as it seemed impossible that CO2, which made up only 0.03% of the air, could have such a large effect on temperature.   However, in 1997, J.T. Kiehl found (8) that, under clear sky conditions, CO2 accounted for 26% of the greenhouse effect – with water vapor accounting for most of the rest. More recent research (9) has confirmed their work, and CO2 has been labeled the “Control Knob” for the Earth’s temperature.  Recent research in the Journal of Climate, covering the last five ice ages, has experimentally confirmed Plass’ work. The Earth is warming because of the greenhouse gases we emit, and research finds the increase in CO2 is the main cause.

Temperature record: Fact six is based on the idea that 1998 was so hot, it couldn’t have been hotter since. However, NASA’s temperature record shows that 2005 and 2010 are tied for the warmest year on record and the last decade has been the hottest in recorded history – and the trend is yet upward (10). There have been attempts to discredit NASA’s temperature data by challenging the accuracy of the temperature recording stations, but a study of that issue by the American Geophysical Union found that claim to be false. (11) NASA has put men on the Moon and brought them home safely, and they certainly should be able to measure temperatures on the Earth correctly.

Polar Bears:  It’s true that the Polar bear population has increased, but not because the Polar ice is increasing. The bears were hunted nearly to extinction, and their population is increasing because restrictions were placed on hunting them from aircraft . Recently, Polar bears have been put on the threatened species list, not because of their numbers, but because their habitat is disappearing.  Satellite measurements of the Arctic sea ice have shown that both the volume and extent of the sea ice has decreased remarkably over the last 30 years. (12) Polar bears are uniquely adapted to live and hunt on the Arctic Sea ice. As it disappears, so will the Polar bears.

Claiming something as “fact” does not make it so. And, even facts can be misleading if the inferences drawn from them are in error.  If Senator Inhofe bases his position on facts such as those listed by Mr. Williams, it is easy to see why he incorrectly thinks global warming is a hoax.

(1)http://www.tulsaworld.com/opinion/article.aspx?subjectid=62&articleid=20110313_222_G2_CUTLIN933913

(2)http://www.tulsaworld.com/opinion/article.aspx?subjectid=62&articleid=20110403_62_G2_InhisM784632

(3) http://jcmooreonline.com/2010/01/29/the-oregon-petition-how-can-31000-scientists-be-wrong/

(4) http://en.wikipedia.org/wiki/Scientific_opinion_on_climate_change#General_science

(5) http://articles.cnn.com/2009-01-19/world/eco.globalwarmingsurvey_1_global-warming-climate-science-human-activity

(6) http://jcmooreonline.com/2010/12/31/science-global-warming-and-the-ice-age-mystery/

(7) http://www.aip.org/history/climate/co2.htm#M_25_

(8) http://journals.ametsoc.org/doi/abs/10.1175/1520-0477%281997%29078%3C0197:EAGMEB%3E2.0.CO;2

(9) http://www.sciencemag.org/content/330/6002/356.abstract

(10) http://data.giss.nasa.gov/gistemp/2010november/fig2.gif

(11)http://www.agu.org/pubs/crossref/2010/2009JD013094.shtml

(12) http://climateprogress.org/wp-content/uploads/2011/01/NSIDC-12-10.gif

(c) 2011 J.C. Moore

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The Case of Global Warming and Extreme Weather

Tue ,22/03/2011

“We know who the culprit is, we just can’t prove it – yet.”  Detective Dick Tracy

The Case. That statement could have been uttered by climate scientists. They know global warming is the cause of the more extreme weather events we are experiencing, but it is hard to prove it.  Global warming has increased the energy and moisture in the atmosphere, and that combination makes conditions ripe for severe storms and floods. Certainly, hurricanes occur and intensify over low-pressure areas fed by moisture and warmer oceans. To be accurate, however, climate scientists could only say, “When weather events occur, global warming is likely to make them more extreme.”  However, the case against global warming is growing stronger. A number of recent research papers have shown global warming is the cause of extreme weather events, and the business community, particularly insurers, are beginning to take notice. (1)

The Link. The vapor pressure of water is one of the most important factors in determining weather. Water will evaporate from the surface until the air above it reaches its saturated vapor pressure. The saturated vapor pressure depends only on the temperature, which makes temperature the determining factor controlling the amount of moisture that the air can hold. (2) If a mass of air saturated with moisture moves to higher altitudes or encounters a cold front and is cooled, the air becomes supersaturated, which leads to precipitation. Over the last century, the Earth’s average temperature has increased by about 0.8°C, which translates into an increase in the saturated vapor pressure of water of about 7%. When precipitation occurs, on the average, 7% more moisture is available. It is a reasonable conclusion that when it rains, it will rain more and when it snows, it will snow more. So strangely enough, global warming could actually lead to greater snowfall. However, it has been very difficult to prove, and certainly even more difficult to convince skeptics that that might be the case.

Floods. Two recent research papers have established a link between global warming, increased rainfall, and flooding. A recent paper in Nature (3) reported that the observed increase in rainfall in the Northern Hemisphere in the past 50 years and climate change are linked. The researchers analyzed the rainfall data in areas prone to flood and found that the rainfall has increased due to the warmer temperatures of the Earth. Their results “were based on a comparison of observed and multi-model simulated changes in extreme precipitation over the latter half of the twentieth century analyzed with an optimal fingerprinting technique.” They also found that the models seem to underestimate the observed increase in heavy precipitation with warming temperatures. Extreme precipitation in the future may be even more severe than now predicted.

The second paper, also published in Nature (4), has linked the increasing floods in England and Wales and global warming. The researchers generated several thousand climate model simulations of the autumn 2000 weather by using actual conditions and also by assuming conditions as they would have been had no greenhouse gas emissions or global warming occurred. They concluded that “the precise magnitude of the anthropogenic contribution remains uncertain, but in nine out of ten cases our model results indicate that twentieth-century anthropogenic greenhouse gas emissions increased the risk of floods occurring in England and Wales in autumn 2000 by more than 20%, and in two out of three cases by more than 90%.

Rivers in the Sky. Normally, when an air mass saturated with water moves ashore and is forced upward, it  cools and precipitation falls until the clouds are no longer over-saturated. However, that is not the case for “rivers in the sky, weather patterns that carry a stream of air saturated with water into coastal regions  continually for days. These  “rivers in the sky”,  cause flooding rains in coastal and inland mountains causing untold costs in property damage and human lives. One such river produced more than 40 inches of rainfall in the mountains of southern California in only four days in early January 2005. It caused widespread flooding and massive mudslides such as the one in La Conchita, California, which took 10 lives. The researchers say these “rivers in the sky” will become more common as global temperatures rise since warmer air means that the atmosphere can hold more water vapor. That is, unless global warming changes the weather patterns that produce them. (5)

Droughts. The link between global warming and droughts has not been yet established by research. Areas that receive little moisture from the oceans would not benefit from the fact that the air can hold more water. Though higher temperatures mean that more water evaporates into the air, it also means that the air can hold more moisture before becoming saturated. Areas that normally experience droughts are much more likely to have less rainfall in the future. This past year has seen droughts in Russia, China, and South America that have limited the production of grain and increased the chances that some species may become extinct. The heat waves in Europe in 2003 and 2010, that caused widespread crop failure and wildfires, may have been the worst in 500 years. Certainly, more frequent and extensive droughts may occur in a warming world. (6)

The Smart Money. The widespread damage caused by weather events related to global warming has caught the attention of the business community, particularly those who pay out insurance claims or invest large sums of money. Insurance companies ranked 2010 among worst years ever for climate disasters. Climate change is the culprit in many of the catastrophic natural disasters in 2010, according to insurance company Munich Re, one of the largest global insurance carriers. It added that trends are pointing to more frequent and riskier events in the future. (7) Recently, a group of International investors, responsible for more than $15 trillion in assets, issued a global warming warning. (8) They called for the world’s nations, particularly the United States, to move decisively to combat climate change or face the possibility of economic disruptions even worse than the global recession of the last two years. They also pointed out that “The economic opportunities are enormous for nations with the foresight to seize them while the risks of inaction are potentially catastrophic.”

(1) http://www.smartplanet.com/business/blog/intelligent-energy/studies-prove-link-between-human-activity-and-extreme-weather-events/4835/

(2)  http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/relhum.html#c3

(3) http://www.nature.com/nature/journal/v470/n7334/full/nature09763.html

(4) http://www.nature.com/nature/journal/v470/n7334/full/nature09762.html

(5)  http://www.noaanews.noaa.gov/stories2005/s2529.htm

(6) http://www.sciencedaily.com/releases/2011/03/110318091141.htm

(7) http://www.scientificamerican.com/article.cfm?id=insurance-ranks-2010-worst-for-climate-disasters&page=2

(8)  http://www.latimes.com/business/la-fi-climate-financiers-20101117,0,6204171.story

(C) 2011 J.C. Moore

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It’s Not Cap-and-Tax and Reagan Made It Work

Fri ,18/02/2011

Our current Congressional leaders, particularly those who would ignore science or derogatorily call Reagan’s system “cap-and -tax”, should look to Reagan as an example.

The U.S. has been unable to make much progress on environmental issues because of opposition by our Republican leaders. They have inflated the cost while ignoring the benefits, labeled environmental issues as “liberal” to discourage support by conservatives, spread false “science”, and biased voters against a cap-and-trade approach by labeling it cap-and-tax.  My own Congressman, Frank Lucas,  espouses the current Republican leaders’  views and calls it “cap-and-tax” in his town hall meetings and in his “Frankly Speaking” articles that he sends to small town newspapers in Oklahoma.

Many Republicans recently celebrated Ronald Reagan’s hundredth birthday as he is considered a unifying figure who skillfully blended principle, pragmatism, and service to the nation. He was a thoughtful, traditionalist conservative who was mindful of our stewardship obligation to future generations. He preserved many wilderness areas so they could not be damaged by economic development. The way he solved two pollution problems should set an example for Republican politicians today.

During the 1980s, scientific evidence mounted that the CFCs from spray cans and refrigerants were damaging the ozone layer. The layer filters out UV light which can cause skin cancers and environmental damage. Reagan ignored the political disputes, the ideological posturing, and the claims of economic disaster – and followed the advice of the scientists. He signed into effect the Montreal protocol, banning emissions of CFCs into the atmosphere. The economic catastrophes never came to pass and the ozone layer is recovering.

When Canada became alarmed that emissions from Northeastern power plants were drifting into Canada and acidifying their lakes, Reagan proposed a market solution to the problem. He devised a cap-and-trade system whereby polluters had to pay by buying credits while companies who reduced their pollution would receive credits. In spite of initial complaints, the system worked well and it cost far less than the power companies claimed it would – and none went out of business.

The scientific evidence has become clear and convincing that man’s release of CO2 is causing our climate to change, endangering the environment and the health of future generations. Yet, many of our Republican leaders are unwilling to accept the scientific evidence. The industries involved are saying it will be too costly, and some are claiming it will ruin our economy. The cap-and-trade system put forward to address the problem is stalled by misinformation and political controversies. Our current Congressional leaders, particularly those who would ignore science or derogatorily call Reagan’s system “cap-and -tax”, should look to Reagan as an example.

(C) 2011 J.C. Moore

Climate Skeptic Refutes Self, Confirms Antarctica Warming

Tue ,08/02/2011

If the ice on Antarctica melts, the oceans will rise several meters, inundating low islands and coastal regions.  There is a controversy about the rate at which Antarctica is warming.

The headline read “O’Donnell et al 2010 Refutes Steig et al 2009″. Wow! Steig’s work had been featured on the cover of Nature (1) when he found that over the last fifty years, the Antarctic had been getting warmer by 0.1 C per decade. I wanted to see how it was possible that Steig was wrong, but O’Donnell’s paper was nowhere to be found. My search led me to the Steve McIntyre’s ClimateAudit website. Yes, McIntyre claimed, a peer reviewed paper in J. Climate had refuted O’Donnell.  After wading through some verbiage about the failure of the scientific peer review process and the evils of “Climategate”, the truth emerged. McIntyre was one of the coauthors of the paper and had access to it, though it had not yet been published.

It is considered bad form among scientist to claim that your paper refutes another scientist’s. That is best left for other scientists to decide. It is even worse to do so before your paper is published. There is a prohibition in scientific ethics about making premature and exaggerated claims to the public. Apparently, McIntyre missed that, as he did the same thing in “Climategate” . He claimed the climate scientists were guilty of hiding data, not sharing their raw data, of colluding to keep skeptics from publishing, and of using the peer review process to keep skeptics from publishing. This is, for lack of a better name, the ” Twisted Science Theory”. Five investigations into “Climategate”  found no scientific misconduct. Apparently, McIntyre believes in getting his version of the facts “out there” before the truth can be discovered.

The Feud: But, did O’Donnell’s paper prove the Antarctic was not warming? No, not at all. The refutation claim is part of a running feud McIntyre has with Michael Mann, a coauthor of Steig’s paper. The dispute started much earlier when, after repeated complaints of scientific secrecy, Mann had released the raw data from one of his papers to Steve McIntyre. McIntyre recalculated the results and claimed to have refuted Mann’s work. McIntyre had a bit of trouble getting his work published in a peer-reviewed journal, but after much complaining, the Geophysical Research Letters finally published it. Shortly after its publication, Peter Huybers found McIntyre’s paper to have errors that, when corrected, led to results similar to Mann’s. That should have ended it, but the dispute became a political football when Congress intervened. Congress rejected the National Academy of Science’s offer to investigate the matter and instead chose Edward Wegman, a statistician from George Mason University. Wegman relied heavily on McIntyre’s work and opinions, he refused to answer scientists’ questions about his methods, and he produced a flawed report. Wegman is now himself under investigation by George Mason University for alleged plagiarism and improper research methods.

The Refutation: McIntyre should certainly get some credit for proving Sir Walter Scott’s “Tangled Web Theory”. However, by being a coauthor of a paper in a respected, peer reviewed journal, McIntyre has clearly refuted his own “Twisted Science Theory”. McIntyre’s involvement in O’Donnell’s work and his premature claims of “refutation” made me wonder if McIntyre might have introduced bias into O’Donnell’s methods. I contacted O’Donnell and asked about his funding, McIntyre’s role, and whether he considered his paper a refutation of Steig’s work.

The Scientific Controversy: O’Donnell was very honest and professional in answering my questions. He explained that the idea for the paper arose from a series of posts on McIntyre’s blog and the replies on RealClimate. He explained: “The paper would not likely have happened had I not been presented a challenge by both Dr. Steig and Dr. Gavin Schmidt at the RealClimate blog.” “None of the four of us have advanced degrees and none of our degrees are in the geosciences ”. “Steve McIntyre’s function with respect to the paper was to ensure that, to the best of our ability, we made the best possible use of the available data”. The work did not have external funding and the authors contributed the work, the expenses, and even the page charges from their own pockets.

O’Donnell’s Reply was very diplomatic. Whether his paper could be considered a refutation or not, he said, depended on what you considered important about Steig’s work. The essence of his reply was:

” 1. If you consider the focus in Steig et al.’s abstract ‘Here we show that significant warming extends well beyond the Peninsula to cover most of West Antarctica, an area of warming much larger than previously reported’ – with the conclusion that the warming in West Antarctica cannot be solely explained by an increase in the circumpolar westerlies, then I feel that characterizations of either ‘refutation’ or ‘rebuttal’ are appropriate.

2.  If you consider the overall picture of Antarctica presented by Steig et al. to be the most important – e.g., overall positive trends, though not significant for East Antarctica or the continent, more warming in the Western half than the Eastern – then ‘improvement’ is appropriate.  One must exclude the seasonal analysis, however, as the seasonal differences between our paper and Steig et al. are both significant and physically important in terms of the dynamics driving Antarctic climate.

3.  If you consider the mathematical method used by Steig et al. to be the most important, then either ‘improvement’ or ‘rebuttal’ would be appropriate, though I would lean toward ‘improvement’.  There are two definite mathematical errors in the Steig analysis.  One of the errors has a negligible impact on the results; the impact of the other is significant.  However, the largest differences between the Steig et al. result and ours arise due to using objective criteria for parameter choices rather than heuristics.”

He continued,

“I always viewed the challenge as a friendly one (as, I believe, did Dr. Steig).  Dr. Steig was quite helpful in my email communication with him when we were attempting to exactly replicate his method.  Regardless of the language used by anyone, our paper is only important if it enhances the understanding of what has happened with Antarctic climate and prevents similar mathematical mistakes from being propagated.  In terms of the larger picture, the characterization of ‘refutation’ or ‘improvement’ is less important than the question of whether our paper has made a contribution.”

Steig’s Reply: Now that O’Donnell’s paper has been published (2), Eric Steig has posted an analysis of O’Donnell’s paper on RealClimate (3). He explained the differences in the two paper’s methods, gave credit where he thought O’Donnell had improved on his work, and explained where he thought O’Donnell was in error. His evaluation of the work was summed up in his statement:

” As one would expect of a peer-reviewed paper, those obviously unsupportable claims found in the original blog posts are absent, and in my view O’Donnell et al. is a perfectly acceptable addition to the literature. O’Donnell et al. suggest several improvements to the methodology we used, most of which I agree with in principle. “

Antarctica Is Warming: This reasoned debate stands in sharp contrast to McIntyre’s assertions. The exchange between O’Donnell and Steig is an excellent example of the kind of open academic debate that underlies every significant research conclusion in science. I would not consider O’Donnell’s paper a refutation, but an addition to our understanding. The significant point to me, and they both seem to agree, is that Antarctica, the coldest place on Earth, is warming.

(1) http://www.nature.com/nature/journal/v457/n7228/full/nature07669.html

(2) http://journals.ametsoc.org/doi/abs/10.1175/2010JCLI3656.1

(3) http://www.realclimate.org/index.php/archives/2011/02/west-antarctica-still-warming-2/

V   Share this.        (C) 2011 J.C. Moore

Is the Increasing CO2 Better for Plants?

Mon ,10/01/2011

The concentration of CO2 in the air is increasing rapidly due to our use of fossil fuels. Since plants require CO2, it would seem that the CO2 increase would be good for plants. However, that is a great simplification as the increased CO2 levels may not be good for most plants or for mankind.

CO2: In 1900, Arvid Hgbom found that factories were emitting about the same amount of CO2 as all the world’s volcanoes. This worried some people – but they were told not to worry, the plants and oceans would soon take up any excess. However, that has not been the case. We have destroyed many of the forests that take up CO2. Our factories and other activities now are emitting thirty billion tons of CO2 each year, around 200 times as much CO2 as all the world’s volcanoes. The CO2 dissolves in water to form carbonic acid, which has made the oceans 20% more acidic in the last century. This has damaged the coral and phytoplankton that take up CO2. Also, since CO2 is less soluble in the more acidic waters, the oceans are losing their ability to take up the excess CO2. Measurements by Charles Keeling of atmospheric CO2 levels have shown that the plants and the oceans are not taking up the CO2 nearly as fast as we are producing it. The concentration of CO2 in the air has increased rapidly over the last century, from 280 parts per million (ppm) to 385 ppm, a 38% increase. It would seem that one bright spot might be that the higher CO2 level would be good for plant growth. However, that may not be the case.

Historical Data shows that the concentration of CO2 in the air has varied widely over the Earth’s history, from over 7000 ppm in the Paleozoic era to a low of 180 ppm during ice ages. Ice core studies show that during the last four ice ages, the CO2 concentration was about 180 ppm during the cold periods and rose to about 280 ppm during the warmer interglacial periods. Warmer temperatures occur at the same times as the higher CO2 levels, so it is difficult to sort out the effect on plants caused by CO2 changes from those caused by temperature changes. Ancient plants that grew at higher temperatures and CO2 levels during the Paleozoic Era adapted to the drop in CO2 level and temperatures near the end of that era by developing leaves. Ancient leaved species, such as Ginko and Magnolia, when exposed to higher levels of CO2, change their leaf structures. Other plants have adapted by changing the altitude at which they grow. For the last 6000 years, we have been in an interglacial period. The Earth’s temperature has been relatively stable and the CO2 concentration has been about 280 ppm, except for the last century.

Plant Growth: According to Dr. Surendra Singh, a biologist with a background in botany, modern plants have adapted to the 280 million ppm CO2 concentration that has existed over the last thousands of years. There is no reason to believe that the increasing CO2 concentration would be better for plants as CO2 is seldom the limiting agent in plant growth and seed production. Plants also require water, nitrogen, phosphorous, potassium, sunlight, and trace elements. Over-fertilizing, over-watering, or putting a shade plant in bright sun will harm the plant. More is not always better, and the increasing the CO2 levels might harm plants that are not adapted to higher CO2 levels.

Greenhouses: Commercial greenhouses have found that adding CO2 helps plants grow better. Some people claim that that proves CO2 stimulates plant growth, but that is not necessarily true. In an enclosed greenhouse, the plants quickly deplete the supply of CO2 if more is not made available. That may also be the case with hydroponic gardeners, who claim better production at higher CO2 levels. Specific crops may do better at the higher levels of CO2 – if all the other nutrients are supplied at an optimum level and plenty of water is available. That is not possible for plants in the outdoors. We do fertilize many crops, but doing so depletes the soil of other nutrients and there is an energy cost in producing and spreading the fertilizers.

Experiments: It is difficult to do outdoor experiments on the effect of CO2 levels on crop growth, but a few have been done. One experiment found that wheat grown at higher CO2 levels has more leaf mass and more kernels; however, the kernels are smaller and have less nitrogen, making them less valuable as a food source. In another experiment, higher CO2 levels in wheat used for grazing correlated with lower nitrogen in the leaves, making the crop less suitable for grazing. Agriculture experts are saying that the result of increasing CO2 levels coupled with increasing temperatures will lower crop yields or quality. That has been found to be true in rice production, and rice is a staple for half the world. In an inadvertent experiment, we have found that some invasive species, such as Kudzu, are well adapted to the increasing temperatures and CO2 levels. They have prospered and are expanding their range northward.

Certainly, plants need CO2, but to say more CO2 will make all plants grow better is a great supposition and oversimplification. The Earth’s atmospheric CO2 level is now 385 ppm, possibly higher than it has been in the last 20 million years, and it is increasing every year. By pouring more CO2 into the air each year, we are conducting a great experiment with unknown results. What will happen if the production from agricultural plants decreases significantly?

(C) 2011  J.C. Moore

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Science, Global Warming, and the Ice Age Mystery

Fri ,31/12/2010

In the early 1800′s, scientists began a search for the cause of the ice ages. That search has led to a discovery of the factors that affect the Earth’s temperature, an understanding of the current global warming, and the solution to the mystery of the ice ages. *

The Data: Science is a way of understanding nature by using observation and reason. Man has always been keenly interested in the weather, but temperature records before 1850 were mostly historical accounts of storms, heat waves, or when bodies of water froze. Thermometers came into use in about 1850, allowing more accurate temperature records. One of the most useful records is NASA’s graph of the Earth’s annual mean temperature, which was compiled from ships logs, weather stations, and satellite measurements. It serves as a scorecard for telling whether the Earth is getting warmer or cooler. NASA’s data has small random variations from year to year because of factors such as sunspots, weather events, ocean currents, and particulates from volcanic eruptions. However, NASA’s graph shows that the Earth’s temperature has clearly trended upward since 1880 – with the exception of a curious plateau from 1945 to 1975 followed by a steeper rise in temperature. The Earth’s mean temperature is now 1.3 F higher than in 1880, and the last decade has been the hottest on record. Any theories or causes put forward to explain the global warming trend must be consistent with the temperature observations.

Possible Causes: Nineteenth century scientists realized from geological evidence that the Earth had gone through many ice ages that alternated with ages of warmer climate. Much of the early research on global warming was a search for the cause of the ice ages. Scientists found that many small variables cause the Earth to warm and cool, but the main three causes are the Sun, particulates, and greenhouse gases.

The Sun’s output seems to have been reasonably stable over the last several million years. Satellite measurements over the last 30 years have shown that while solar radiation has declined ever so slightly during that time, the Earth continued to warm – so clearly changes in the Sun’s output is not the cause of the recent warming. The amount of sunlight the Earth receives does, however, depend on the Milankovitch Cycles. These cycles are small variations in the eccentricity, axial tilt, and precession of the Earth’s orbit that cause the solar insolation, the amount of sunlight the Earth receives, to vary slightly in predictable cycles. Ice core data shows that ice ages tend to occur in roughly 100,000-year cycles that match the timing of the Milankovitch cycles. The temperature between the ice ages and the warm periods, however, are much greater than would be caused by the changes in solar radiation alone. Though a clue to the cause of the ice ages, the Milankovitch Cycles are not the cause of the current warming. They predict a minor cooling trend, which began some 6,000 years ago, will continue for the next 23,000 years. The current warming trend is too rapid and in the wrong direction for the Milankovitch Cycles to be the cause.

Particulates cause the Earth to cool by reflecting incoming sunlight back into space. The role of particulates in cooling the Earth became apparent in 1816 when ash from the explosive eruption of Mt.Tambora caused that year to be called “the year without a summer”, worldwide. The curious plateau in NASA’s temperature record from 1945 to 1975 was primarily caused by particulates from sources such as WW II, atmospheric nuclear testing, and increased industrialization. Research during the early 1970′s showed a huge increase in aerosol particulates from power production, factories, and vehicles – and some alarmists even speculated that we might cause another ice age. Particulates are visible and cause immediate health problems, so by 1980 most industrialized countries had restrictions on particulate emissions. Particulates cannot be the cause of global warming, but reducing their sources can cause the temperature to rise as can be seen in the temperature record after 1980.

The Greenhouse Effect was discovered in the early1800′s when scientists realized that the Earth was kept warm at night because the atmosphere trapped invisible heat rays rising from the surface. Around 1860, John Tyndall identified the invisible rays as infrared radiation and found the main gases that trapped the heat rays to be water vapor and CO2. The amount of water in the air remains relatively constant because of the water cycle. When the humidity is low, water evaporates, and when the humidity gets too high, it rains. However, CO2 has no such restrictions. Since CO2 makes up only a few hundredths of a percent of the air, it was at first dismissed as a possible cause of warming, especially since it was thought that plants and the oceans would absorb any excess.

In 1896, Svante Arrhenius, while still pursuing the idea that variations in CO2 might be the cause of the ice ages, laboriously calculated the effect of cutting the amount of CO2 in the atmosphere by half. He found that doing so would lower the temperature of Europe by 4-5 C, perhaps enough to bring on an ice age. He also found that doubling the amount of CO2 might raise the temperature of the atmosphere by 6-7 C. No one was concerned as Arrhenius’ model of the atmosphere was very crude and it was inconceivable that the amount of CO2 in the air could ever double. Some scientists speculated that man should intentionally add more CO2 to the air to ward off another ice age.

As models of the atmosphere improved, a number of scientists tried to get a better estimate of the effect of doubling the amount of CO2 on the Earth’s temperature, but the increasing complexity of the models made the calculations daunting. A breakthrough came with the development of computers. In 1956, G.N. Plass calculated that doubling the concentration of CO2 in the air would cause a 3 to 4 C increase in the Earth’s temperature. ** Many dismissed his work, as it seemed impossible that CO2, which made up only 0.03% of the air, could have such a large effect on temperature. However, in 1997, J.T. Kiehl found that, under clear sky conditions, CO2 accounted for 26% of the greenhouse effect – with water vapor accounting for most of the rest. More recent research has confirmed their work . Clearly, CO2 could have a significant effect on the Earth’s temperature if it was increasing. But was it?

CO2: In 1900, Arvid Hgbom calculated the amount of CO2 emitted by industrial sources and, surprisingly, found that man was adding CO2 to the atmosphere at roughly the same rate as volcanoes. No one thought much of it as, at that rate, it would take centuries for the amount of CO2 to increase significantly. However, after a protracted heat wave during the 1930′s, Guy Callendar re-examined previous temperature and CO2 measurements and found not only that the Earth was getting warmer, but also that atmospheric CO2 concentrations were increasing rapidly. Callendar’s work was mostly ignored, but a few scientists began monitoring the concentration of CO2 more closely. Their results were sporadic but, by 1958, Charles Keeling had established accurate procedures for measuring atmospheric CO2. His lab was eventually moved to the Mauna Loa observatory, far away from most CO2 sources. His graph showing how CO2 varies with time, now called the Keeling curve, proved to be an important piece of evidence. It showed that the oceans and plants were not taking up CO2 nearly as fast as man was producing it. Over the last century, the atmospheric CO2 concentration has risen from 280 parts per million (ppm) to 385 ppm, a 38% increase, and the Earth’s temperature has risen by 0.8 0C, well in line with Plass’ prediction. The role of CO2 as the major cause of global warming had been convincingly established. There is yet one more piece of evidence that confirms that conclusion.

Ice Ages: It was now possible to solve the mystery of the ice ages. The Milankovitch cycles alone cannot explain the changes in the Earth’s temperature during the cycles, but the process becomes clear if CO2 is included. The ice core data shows that the concentration of CO2 falls to about 180 ppm during an ice age and rises to about 280 ppm during the warm part of the cycle. The changing CO2 concentration happens because the solubility of CO2 in water varies with temperature. In the part of the cycle where the Earth is warmed by the increasing solar radiation, the oceans release CO2, which further amplifies the warming by the greenhouse effect. In the part of the cycle where the solar energy decreases, the oceans cool, the CO2 dissolves again, and another ice age begins. The concentration of CO2 in the atmosphere is the “control knob” for the Earth’s temperature – and we have now turned the knob up to 380 ppm and are moving it even higher. The Earth will surely get warmer.

* Much of the historical data came from this excellent AIP article.

 **  Recent research in the Journal of Climate, covering the last five ice ages, has experimentally confirmed Plass’ estimate of the climate sensitivity.

(C) 2010 J.C. Moore

Should the EPA Limit Carbon Emissions?

Wed ,29/12/2010

The U.S. Republican leaders are blocking climate legislation, leaving the EPA in the position of having to regulate carbon emissions. Many Republicans in Congress are unhappy with the EPA and are now claiming the EPA regulation of CO2 is a “power grab”.

Progress has been limited at the climate meetings in Copenhagen and in Cancun because the U.S. has not acted to restrict its carbon emissions. The U.S. is second to China  in emissions but emits six times as much CO2 on a per capita basis. If the U.S. is not willing to reduce its emissions, why should other countries?  The U.S. came very close to passing cap-an-trade but it failed when John McCain (R Az) backed out of the deal because of a challenge from a far right candidate in the last election. Reducing CO2 emissions has been cast as a liberal issue and many conservatives oppose it for that reason. The wins by Republicans in the last election almost insure that action on a responsible policy will be delayed by at least two years. That is a shame as many Republicans in the past have been strong supporters of the environmental issues.

The Republican leadership adopted opposition to environmental regulations as a campaign strategy. They sent out propaganda based on slick reports produced by conservative think tanks, rather than science, and they inflated the cost of environmental legislation by a factor of twenty – while not mentioning any of the benefits. The propaganda has been passed along to voters in town hall meeting and press releases. The EPA has used science as a basis for its decisions and has moved to limit CO2 emissions as an air pollutant under existing regulations in the Clean Air Act. This has infuriated many Republicans anfd they have challenged the EPA’s right to do, calling it a “power grab”.

My Congressman,  Frank Lucas (R-OK), has spoken disparagingly of environmental regulations in his town hall meetings and in opinion pieces he has sent to the states major newspapers. He also writes a column that goes to many small town newspapers called “Frankly Speaking”. In his column, he has  labelled the EPA’s actions to limit carbon emissions as  “the EPA power grab” . That is hardly the case. The Supreme Court, in Massachusetts v. EPA, found the Environmental Protection Agency could make a determination as to whether carbon dioxide is a pollutant. The EPA has found, based on the best scientific evidence, that CO2 is an endangerment to public health and has moved forward to regulate it.

If Congress had acted to develop a sound energy policy and to curb pollution, the  EPA would not be forced to act in the matter. Regulations passed to limit carbon emissions would fall mainly on the coal industry and would favor a shift in the short term to petroleum and natural gas, both abundant in Oklahoma. Many from the petroleum and gas industries originally supported the cap-and -trade bill. However, all the OK Republican Congressmen sat out the process and let the Democrats from coal producing states load up the cap-and-trade bill with perks for coal producing states. Some of  Oklahoma’s industrial leaders see that limiting carbon emissions could be favorable to the Oklahoma economy, but apparently, the elected representatives have not caught on yet.

And, it is not just about the CO2 or climate change. Along with the 30 billion tons of CO2 we put into the air annually are large amounts of mercury, lead, cadmium, arsenic, sulfur oxides, nitrogen oxides, particulates, and radioactive isotopes of radon. Those end up in the air, the water, and the food chain. We are now finding mercury in fish and some places, even in Oklahoma, have limits on consumption. The oceans are now 20% more acidic and economically important fisheries are threatened. Whether we cap pollution, tax it, or strictly regulate it – something must be done and soon. The EPA regulation is a stop gap meaure and the U.S. Congress needs to stop the politics and pass a sound energy policy and meaningful environmental regulations.

(C) 2010 J.C. Moore

Is the Media Biased about Climate Change?

Wed ,15/12/2010

Certainly,  many people are confused or misinformed about climate change. There are many conflicting reports in the media – and few topics have engendered as many claims and counterclaims of media bias .  The issue of Climate Change and the Media was the subject of a 2006 Senate hearing of the  Committee on Environment & Public Works. It is a good place to start to examine the matter.

Media Bias generally refers to accusations of either censorship or propagandism on the part of particular news sources, where such content is framed in the light of a preconceived agenda. Relevant categories of bias include favoring a station’s corporate economic interests, having a political slant, or sensationalism that tends to distort news to make it a better commercial “product.”

The Hearing: The hearing was chaired by Senator Jim Inhofe (R-OK). In his opening statement, he accused the media of over-hyped reporting, of subverting its role as an objective source of information on climate change into the role of an advocate, and of hyping scientifically unfounded climate alarmism. Apparently no testimony was needed.

It was an interesting cast of characters who testified before the committee, two climate skeptics, a climatologist, a science historian, and an oil company lobbyist.Their testimony and the author’s short comment on each follow below:

Dr. R. M. Carter is a marine biologist and well known author from Australia. Dr. Carter testified that his research showed that throughout history, the rise in global temperatures had proceeded rising carbon dioxide concentration. His claimed that some natural cause must be causing the Earth’s temperature to rise, which released the carbon dioxide.

Comment: After the hearing, he was challenged by climatologists to produce any research showing the natural variablilty he claimed, but none has yet been produced. He also should have been aware that the recent CO2 increase has come from the billions of tons of fossils fuel burned each year by man. It is interesting that Senator Inhofe was concerned about media bias in Australia.

Dr. Daniel Schrag is a climatologist from the Department of Earth and Planetary Sciences at Harvard. He testified that there is no serious debate about whether the Earth will warm as carbon dioxide levels increase over this century – as it will. The burning of coal, oil and gas, and deforestation are playing a significant role in increasing CO2 levels. The current level, in excess of 380 parts per million (ppm), is higher than it has been for at least the last 650,000 years, and perhaps for tens of millions of years. We know from Lonnie Thompson’s work on tropical glaciers that this warming is not part of any natural cycle.

Comment: His testimony represents the accepted scientific viewpoint on global warming. Skeptics would claim there is still a serious debate, that the science is not settled, and that man is not the cause of global warming. His testimony contradicted that of Dr. Carter on natural causes and he backed it with a reference to the research.

Dr. David Deming is a geophysicist from Oklahoma University. He reported that his research on oil well borehole temperatures showed a warming of about one degree Celsius in North America over the last 100 to 150 years. He also claimed that the Earth’s temperature has not gone up in the last 10 years and that the Earth was entering a cooling period.

Comment: The one degree temperature rise he reports is consistent with NASA’s data but NASA’s data also shows that 1998 and 2005 have been record highs and that the trend is clearly upward. Dr. Deming is a controversial figure and he has been removed from most of his teaching duties at OU because of his unorthodox views.

Dr. Naomi Oreskes is a Professor of History and Science Studies at the University of California. She testified that in1983, the National Academy formed the Nierenberg committee to examine the scientific evidence of global warming. The committee accepted the scientific conclusions, but declined to view global warming as a problem, predicting that any adverse effects would be adequately remedied by technological innovation driven by market forces. This prediction has not come true as technological innovation has not saved the homes of the citizens of Shishmaref, Alaska, nor stopped the acidification of the world’s oceans, nor prevented the melting of polar ice.

Comment: The testimony was an accurate account of the history and points out some of the effects of global warming on the oceans and the lives of native Alaskans. The village of Shishmaref, inhabited for 400 years, is facing evacuation due to erosion from waves now allowed by the disappearance of year round sea ice, and the thawing of coastal permafrost. Skeptics would claim that there is no global warming so there was no need for markets to respond, that the melting ice is natural, and that the oceans are only more acidic by 0.1 pH unit. (Note: That means they are 20% more acidic.)

Dan Gainor is a Boone Pickens Free Market Fellow and Director of the Business & Media Institute (BMI). He testified that journalists claiming to provide the “truth” on climate change are criticizing America for its stance on the issue and on the Kyoto treaty, while ignoring the billions of dollars such an agreement would cost America. The media is obsessed with Al Gore’s film “An Inconvenient Truth.” Let’s recall the media’s irresponsible position, when roughly 30 years ago they reported a new ice age was coming and we would all freeze to death.

Comment: He claims journalists reporting the scientific view on global warming are unpatriotic and anti-business. Of course, BMI was formed to combat media bias against America’s free enterprise system and expose the anti-business agenda of environmental extremists. He is correct that some reporters sensationalized the “new ice age”, but after 30 years, he and others are still using the incident to discredit the press and science. His attack on Gore’s movie was unfounded. Interestingly, in 2007, Dr. Carter was the star witness for the plaintiff in Dimmock v Secretary of State for Education, who sought to prevent the educational use of An Inconvenient Truth in England. The court apparently did not agree with Dr. Carter and ruled that, though the film had some errors, it was substantially founded upon scientific research and fact and could be shown.

Was the hearing biased? It would seem balanced in that two of the four scientists who testified represented the scientific side and two were skeptics. However, it was actually heavily weighted toward the skeptic side. A CNN survey found that 97% of climatologists who are active in climate research say the Earth is warming and humans play a role, yet two of the four scientists who testified did not agree. Dr. Carter and Dr. Deming have research records in other fields that give them credibility as scientists, but they are also journeymen for climate skepticism who can be counted on to deny global warming. Dr. R.M. Carter claimed the warming was from natural causes though he has not published or produced any research to back his claim, though asked. Dr. David Deming claimed the Earth warmed until 1998 and then entered a cooling trend. NASA’s data shows that 2005 was the warmest year on record so that is clearly not right.

Dan Gainor’s testimony was not balanced by an opposing view and there was not really testimony from journalists. The witnesses might have included Eric Pooley, deputy editor of Bloomberg Businessweek. He thinks that the press misrepresented the economic debate over carbon cap and trade, failed to perform the basic service of making climate policy and its economic impact understandable to the reader, and allowed opponents of climate action to set the terms of the cost debate.

The purpose of the hearing was seemingly to discredit the journalists and the scientists who do not agree with Senator Inhofe’s views. In his opening statement, he named and criticized a number of journalists and news organization who had been critical of him or his views, but those accused were not there to defend their views. Senator Inhofe claimed the press was not accurately reporting the “hard science”, though his beliefs are inconsistent with the “hard science” produced by scientific research. His stance on global warming, which he has stated many times is “Global warming is a hoax”.

Is the media biased? The “media” includes many sources, but overall the answer seems to be “Yes”. The media likes to sensationalize stories to attract attention and it often moves on without correcting the errors it commits. The story about the “Coming Ice Age” is an example . Few scientists believed that story at the time, but some editorial writers are still pointing to it as a failure of science. TV weather reporters often claim that a particular weather event is caused by global warming. That cannot be proven but it keeps the controversy stirred up and provides easy targets for skeptics. There is also a rush to be first with a story before the matter has been investigated as in the case of Climategate. After all the controversy, charges , and countercharges, the investigations cleared the scientists of scientific misconduct. But, once a story is “out there”, it can never be taken back.

The media also has a general bias toward the status quo. It’s easy, it involves little risk to the newspaper, and it is fine with those who have a financial or political interest in continuing the status quo. In 1997, the Wall street Journal, published an article titled “Science Has Spoken, Global Warming Is a Myth”. The article turned out to be a hoax , but it came right before the Senate was to consider the Kyoto Treaty and may have influenced the Senate to reject ratification, maintaining the status quo.

The press also presents stories as controversies to catch readers interest. They sometimes try to present both sides, even though there is little evidence to support one side. This is certainly true in the case of global warming where all the world’s major scientific organizations have endorsed statements that global warming is occurring, that it is caused mainly by mans’ activities, and it is causing undesirable changes in the environment. Sometimes the press doesn’t try to present both sides. Newspapers often report politician’s statements critical of climate science without balancing it with a scientist’s opinion. One example would be that many newspapers print Senator Inhofe’s famous statement “Global warming is a hoax.” but never point out that all four scientists at his hearing, even the skeptics, testified that the Earth was warming. Another point of view was expressed at the hearing by committee member Senator James Jeffords (I-VT) who said “ I can only say that I am sorry that I was not able to do more to change the minds of the few skeptics that remain in our nation. The climate is warming, it is due to human activity, and only a change in human behavior will ensure that my grandchildren will not suffer the consequences.”

Journalism Ethics: The solution to much of the bias would be for journalists and news media to follow the Ethical code of The Society of Professional Journalists, who believe that it is the ethical duty of the journalist to:

Seek the Truth and Report it: Journalists should be honest, fair and courageous in gathering, reporting and interpreting information.

Act Independently: Journalists should be free of obligation to any interest other than the public’s right to know.

Be Accountable: Journalists are accountable to their readers, listeners, viewers and each other.

It is a principle of professional ethics that anyone who practices the profession, whether a member of the professional organization or not, is bound by the code of ethics of the profession. In this case, the ethical code would apply to anyone who reports the news.

(c) 2010 J.C. Moore

Science, Climate Change, and the Greenhouse Effect

Mon ,13/12/2010

In the 1800′s, scientist began to understand the role greenhouse gases  had in keeping the Earth warm. The greenhouse effect is now a well established scientific principle. Both the science and the data show that  current global warming is caused by the increasing CO2 in the atmosphere.

Greenhouse Effect: Most gardeners know how greenhouses work.  In the daytime, the sun’s radiation (visible and UV) comes in through the glass and warms the plants and soil.  The glass stops the heat radiation in the infrared (IR) region from passing back through and the greenhouse stays warm enough to keep the plants from freezing, even at night. The Earth works much the same way except greenhouse gases, primarily water and  carbon dioxide, play the role of the glass and trap some of the leaving IR radiation. Winter nights on Earth would be very cold without greenhouse gases.

Earth’s Energy Balance: Of the Sun’s energy coming to Earth, 30% is reflected immediately back into space by particles in the air, by clouds, and by the surface. Another 20% is absorbed by the atmosphere where it runs the weather cycle. The remaining 50% heats the land and oceans. All the absorbed heat is eventually radiated back into space as infrared radiation. It’s a balanced energy budget, 100% in and 100% back out. Anything that reflects more light back into space, such as an increase in particulate matter in the air, would cause the Earth to cool. Anything that delays the energy’s trip back to space, such as an increase in greenhouse gases, would cause the Earth to warm. There are many small things that affect the Earth’s energy balance, but the main three are the Sun, particulates, and greenhouse gases.The ash from the explosive eruption of Mt.Tambora in 1816 caused that year to be called the year without a summer, worldwide.

The Sun: Certainly a change in the Solar radiation the Earth receives would cause a change in  the Earth’s temperature. Small wobbles in the Earth’s orbit, the Milankovitch Cycles, are variations in the eccentricity, axial tilt, and precession of the Earth’s orbit. They affect the amount of solar radiation the Earth receives in predictable cycles. Both scientists and skeptics agree that these cycles are responsible for the Ice Ages that occur in roughly 100,000-year intervals. In the part of the cycle where the Earth receives more solar radiation, the oceans slowly warm and release CO2. The CO2 further amplifies the warming by the greenhouse effect. As the Earth moves into the part of the cycle where it receives less solar radiation, the oceans slowly cool, the CO2 dissolves back into the oceans and another ice age starts. The patterns of wobble in the Earth’s orbit are predictable and the model predicts that a minor cooling trend, which began some 6,000 years ago, will continue for the next 23,000 years. The current warming trend is too rapid and in the wrong direction to be a part of the Milankovitch Cycles.

The Sun also has cycles where its output varies slightly such as  Sunspots activity. They cause the amount of solar radiation to vary in approximately 11-year cycles. However, the effects of Sunspots are so small that they do not show up above the other small variations in NASA’s temperature record.(see below). Long term variations in the Sun’s intensity are not responsible for the current warming. The graph of solar irradiance from 1880 to the present in this article shows that the Sun’s intensity increased slightly from 1880 to 1960 and then has declined slightly since 1960.   Satellite measurements of solar radiation show also that the solar radiation reaching Earth has declined slightly over the last 30 years – yet the Earth still warmed.

Temperature Data: The best temperature data we have clearly shows the Earth is getting warmer. NASA has compiled the Earth’s average temperature for each year since 1880 by using ships logs, weather stations, and satellite measurements. In the graph below , each square dot shows how far that year’s average temperature was above or below the 1970 value.  Although the data varies widely from year to year because of random factors such as sunspots, weather events, ocean current, and particulates from volcanoes and man’s activities,  the trend is clearly upward. The solid red and blue lines are  moving averages, which make the trend easier to follow.

NASA's Temperature Data  Credit: NASA JPL GISS

Credit: NASA/JPL/MSSS

Temperature Trend: The greenhouse effect links some of the causes of the temperature trend to man’s activities. The trend took a turn upward in about 1920. That was when the automobile, industrialization, and energy production began further increasing the carbon dioxide concentration in the air. The trend was flat from about 1945 to 1975 and  that can be attributed mostly to particulates. There was an increase in particulates after 1945 from many sources such as WW II, atmospheric nuclear testing, and increased industrialization. Research during the early 1970′s showed a huge increase in aerosols from power production, increased industrialization, and vehicles and some alarmists even speculated that we might be causing another ice age.  Particulates are visible and cause immediate health problems so by 1980 most industrialized countries had restrictions on particulate release. During the period from1945 to 1975 the CO2 concentration had continued to rise but its effect had been masked by the particulates. Reducing the particulates in the air allowed the full effect of the CO2 to be felt, causing the Earth’s temperature to begin to rise again. The effect of particulates and the reliability of the temperature record can clearly be seen in the graph above. In 1991, Mt. Pinaturbo erupted spewing about 10 cubic kilometers of ash into the air which caused an immediate 0.3 °C temperature drop  for the entire Earth, lasting until about 1995.

Causality: Although the greenhouse effect is a well accepted principle, skeptics sometimes claim the correlation between global warming and CO2 does not constitute causality. However, G.N. Plass, in 1956, calculated the climate sensitivity of the Earth to CO2. He found that doubling the concentration of CO2 in the air would cause a 3 to 4 °C increase in the Earth’s temperature. A number of more recent studies have confirmed his work and have shown that, though the concentration of CO2 in the air is small, it accounts for about 25% of the greenhouse effect. No natural occurrences such as volcanoes, sunspots, fires, or dust storms can account for the major trend in the data. Certainly, the increasing amount of CO2 in the air is causing the Earth to warm.

Man’s Role: Man’s activities, mainly through deforestation and burning fossil fuels, have released large amounts of CO2 into the air. In the last century, man’s emission of CO2 from fossil fuels have increased to over 30 billion tons annually and the concentration of CO2 in the air has risen from 280 parts per million (ppm) to 385 ppm. The processes that remove carbon dioxide from the air takes decades or longer so as the carbon dioxide concentration slowly built up, the Earth became a better greenhouse. The concentration of carbon dioxide in the air is now 38% higher than in 1880 and the Earth’s temperature is about 0.8°C (or 1.3 °F) higher. Clearly, man’s activities are mainly responsible for increasing the CO2 concentration in the air – and the increasing CO2 concentration is causing global warming.

(C) 2010 J.C. Moore

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Climate Change and Future of Health – Human Adaptability

Sun ,12/12/2010

This is a guest article by Pabitra Mukhopadhyay who is an advocate for the indigenous people of the Sunderban wetlands in Bengali, who are fighting a losing battle against aggressive industrialization and the effects of climate change.

So what will it be like in a 1.5 degree warmer world? A world of 450 ppm CO2 in atmosphere? While there is a lot of discussion on bio-diversity loss, sea level rise, melting polar caps, Climate Change is going to affect the health and well being of humanity in a profound way putting adaptability in a test that 100,000 years history of human race has never confronted.

This is not the adaptability that is being discussed in Cancun now, the adaptability and mitigation of Climate Change as a series of planned actions. I am talking about the adaptation on biological scale, one that is associated with Darwinian principle of Natural Selection through evolution.

Humans are formidable adapters. For the last 100,000 years of the present Holocene, Global Climatic Conditions have remained relatively warm but highly variable. Between last 100,000 to 200,000 years (towards the end of Pleistocene and beginning of Holocene, there had been several dramatic periods of cooling and warming that led to major continental glacial advances and retreats. Humans adapted to that and still flourished. There had been migrations and dispersion of human race all the while, winning the climate vagaries each genetic strand by strand. By the last 5000 years, human habitat settled from Arctic to Pacific with a highly credible record of adapting to climate variations, from sub-zero temperatures to tropical heat, from rain forests to desert lands, from coasts and rivers to mountains. That’s a feat for a single species – and humans used all tools available for that. It remains one unique life form that used something beyond dumb biological evolution – societal and cultural evolution with it’s ingenuity and intelligence.

That being the record, why are we so scared about Climate Change, then? We are scared because all that record is for natural Climate Change. What is happening since last Industrial Revolution is anything but natural. We have interfered with the natural climatic cycles in such a huge way that the weather system, which is a fairly delicate system as it is, now shows signs of becoming further unpredictable and chaotic. Most unfortunately, the rate of such ‘forced’ climatic variations and changes are so fast that human prowess of adaption is falling short. Anthropogenic forcings are producing a condition where the earth is now absorbing 0.85+/-0.15 watts per square meter (of earth surface) more energy that it is emitting to space – so we are in a state of positive energy balace – earth is getting warmer every day.

Climate Change and Global Warming are often misconceived as large-scale heat waves or draught. Nothing can be farther from the truth. The worst effects of Climate Change are fast and unprecedented Climate variations. Unexpected rainfalls in places that has no history of such weather (Floods in Pakistan) or heat waves in historically cold places (heat waves in Russia). When incidents as strange and rare as these start to happen, the human biological, societal and cultural adaptability cannot handle it effectively. Research has already shown that warming has a direct correlation with human morbidity and mortality and the most affected are children, sick and old people.

1. Temperature extremes (both hot and cold) appear to increase mortality, although there is disagreement about which sex, age group, or race seems most affected.

2. Low relative humidities in winter appear to be directly related to frequencies of various illnesses and mortality.

3. Winter snowfall accumulations appear to correspond with periods of high mortality.

4. Rapid changes in the weather often induce a series of negative physiological responses from the body, like cardio-vascular constrictions, immune deficiency, asthma and skin problems.

The future of world health will come under 3 critical stresses owing to Climate Change. Health standards and health care of post 2030 will largely be determined by these vectors.

a) Heat Stress: Environmental Heat Stress that will affect humans will be in two categories – hot-wet (high humidity) and hot-dry (low humidity). Hot-wet Heat Stress is basically limitation on evaporative cooling (sweating) which is farther worsened by viral and mosquito carried diseases. Hot-dry Heat Stress on the other hand limits water resources, which links with draughts, famines or low-productivity added with ozone depletion related UV radiation and related skin problems. Heat Stress will increase mortality through dehydration (heat exhaustion), total failure of thermoregulatory system (heat stroke) and stress on cardio-vascular system. Most vulnerable will be very young, very old and people doing physical labor in exposed conditions.

Areas that will come under heat stress are: southeastern and mid-continental US, parts of Europe, southeastern Asia (Indian sub-continent) and most parts of Africa. The future of health care in these areas will require new regimes of work, leisure, physical activities and inoculation programs.

b) Nutritional Stress: One likely effect of Climate Change is movements of iso-thermals towards poles. Warming will be greater in higher latitudes compared to temperate and tropical belts. This will cause shift in agricultural pattern and temporarily some regions may even benefit from it. But Climate Warming is also likely to cause increase in plant pests and diseases. The vulnerability of agricultural crops will increase as new insects and pathogens move into newly warm areas. There is general consensus that Climate Warming will lead to water scarcity in dry areas that are already suffering from water stress (India is one). Crop production will be further reduced in quantity and quality in these areas due to increased soil salinization from irrigation and depletion of aquifer reservoirs. Total arable land will be reduced due to sea level rise. All these factors will influence agricultural production and availability of food both regionally and globally. Human dietary habits and health are deeply correlated; the food habits change much slower than we think. So a nutritional stress will affect world health unless less wasteful feeding luxuries are given up and scarce food stock is intelligently utilized. The heath and dietary adaptation in this low yield food scenario will be completely different from the present. New food cycles with insects as one chief source of protein are one possibility and marine grass is another.

c) Disease Stress: The Heat and Nutritional Stress will indirectly cause many diseases during Climate Warming but one scary aspect of Climate Change is the changes in insects and other disease causing vectors and epidemiology of vector-borne diseases like Malaria, Dengue Fever, Rocky Mountain Spotted Fever, Trypanoso-miasis, Guinea warm, Schistosomiasis and Chagas Disease. Global Climate Change can shift some marginal areas from sporadic epidemic to endemic and other areas from disease free to epidemicity. The disease stress will, in my opinion, have the greatest impact on human health and well being and the genetic scale of adaptive changes denied by rapid Climate Change the average life-span of human will be diminished in the last half of this century.

References:

Global Impacts of Anthropogenic Climate Change on Human Health and Adaptability by Michael A. Little and Ralph M. Garruto

Climate Effects On Human Health by Laurence S. Kalkstein and Kathleen M. Valimont

(c) 2010 Pabitra Mukhopadhyay   Pabitra is an Honors graduate in Civil Engineering from Jadavpur University, Kolkata,  who has  spent two decades  fighting erosion  and developing tools for cost effective and natural means of anti-erosion technology.  Reprinted by his  permission from http://climatechange.thinkaboutit.eu/
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