J.C. Moore Online

Current Events from a Science Perspective

This presentation was given at the Great Plains Conference on Animals and the Environment at Fort Hays State University for Earth Day 2016.  The first part of the program presents the evidence for climate change and explains the urgency for taking action. The second part of the presentation explains the Citizens’ Climate Lobby’s  proposal to reduce our carbon emissions below 1990 levels by 2035.  The plan, with broad bipartisan support, would place a fee on carbon at the source and allow market forces to encourage reduced emissions, energy conservation and investments in renewable energy.

Science and Solutions 

Please click on the link above. You will need a PowerPoint program to view the slides – or you may  download a free viewer here. The slides will display as set in your viewer. The slides were meant to be somewhat self-explanatory, but if you have questions you may email the author or post your questions in the comment section. The slides were  prepared by Darrel Hart, Mark Shobe, and J.C. Moore.

In Paris, 196 countries agreed to develop plans to reduce their carbon emissions in such a way as to keep global warming below 1.5°C.  Although each country will develop its own plan,  the best plan for the US, and many other countries, would be a carbon fee and dividend system such as that developed by the  Citizens’ Climate Lobby (CCL), which has broad bipartisan support.  CCL’s proposal would place a fee on carbon at the source, and market forces would then encourage reduced emissions, energy conservation and investments in renewable energy.  The fee collected is not a tax as it would be distributed equally to every household as a monthly energy dividend.

CO2 equivalent emissions: CCL’s legislative proposal would set an initial fee on carbon at $15 per ton of CO2 emission or CO2 equivalent emissions with the fee increasing by $10 each year until the US emissions drop to 1990 levels. The main contributors to CO2 are combustion of coal, natural gas, and gasoline, with minor equivalent emissions coming from other industrial chemicals.  A little chemistry allows us to calculate the tons of CO2 that a ton of each fuel produces.

Coal: It is hard to calculate coal’s contribution exactly as it has from 65% to 95% carbon and the rest is impurities. Those include mercury, cadmium, lead, manganese, selenium, sulfur, nitrogen, and some radioactive elements. Much of the environmental damage and many cases of lung disease can be traced to the impurities and to the mining of coal. For calculation purposes we will assume that coal is all carbon as graphite, but keep in mind that each source of coal is different.

The chemically equation for the reaction of carbon with oxygen is:

Carbon       +     Oxygen    =>        Carbon Dioxide

The mass of each atom or molecule in atomic mass units (MU) is written on the atom. The equation says that 12 mass units of carbon react with 32 mass units of oxygen to produce 44 mass units of carbon dioxide. The equation is like a recipe and once you establish the basic relationship, it can be scaled up to tons quite easily, i.e. :

C            +          O2               =>                 CO2

12 MU Carbon + 32 MU Oxygen  =>   44 MU Carbon Dioxide    – or –

12 Tons Carbon + 32 Tons Oxygen    =>  44 Tons Carbon Dioxide

Thus, each ton of carbon produces 3.6 tons of carbon dioxide.

Natural gas: Natural gas is composed mostly of methane, CH_{4 ,} with small impurities of other hydrocarbon gases. Following the method above:

CH₄            +         2O₂                =>                 CO2                  +          2H2O

16 MU Methane + 64 MU Oxygen   =>  44 MU Carbon Dioxide  +36 MU of Water

16 Tons Methane + 64 Tons Oxygen    =>   44 tons Carbon Dioxide  +36 tons of Water

Each ton of methane produces 2.8 tons of carbon dioxide.

Gasoline: Gasoline is composed of many volatile liquid compounds, but it can best be represented as octane, which has eight carbon atoms and 18 hydrogen atoms, C₈H₁₈. (The model for Octane is large so here we will just work from the equation. )

C₈H₁₈     +         25/2 O₂   =>        8CO2        +         9 H2O

114 AMU  Octane +   Oxygen  =>  352 AMU  Carbon Dioxide  +   Water

114 Tons Octane +   Oxygen  =>  44 tons Carbon Dioxide  +  Water

Each ton of octane produces 3.1 tons of carbon dioxide.

Note: This means that the initial carbon fee on fossil fuels would be around $40-$50 per ton of fuel. This would pay part of the external costs of using the fuel as well as encourage conservation and a shift to renewable energy. One gallon of gasoline is about 7 pounds and it produces about 21 pounds of CO2. That means that 95 gallons of gasoline will produce 1 ton of carbon dioxide. The $15 per ton carbon fee would increase the cost of 95 gallons of gas from about $200 to about $215, or about 7%.

Heat of Combustion: Each fuel releases a different amount of energy when burned, measured in kilojoules  of energy per  mole of fuel burned. Those are listed below along with another important quantity, the amount of heat released per mole of carbon dioxide released.

Note that Methane releases more than twice as much energy as coal for each mole of carbon dioxide produced. This was the impetus to convert coal-fired power plants to natural gas-fired plants. That would help in the short term as natural gas has fewer impurities and produces more energy per mole of CO2 released.  However, there is another factor to be considered which is the Global Warming Potential of each greenhouse gas.

Global Warming Potential (GWP):   The amount that each greenhouse gas contributes to global warming depends upon its concentration in the atmosphere, it’s effectiveness at trapping heat, and its lifetime in the atmosphere. The focus is on carbon dioxide as it is the greenhouse gas whose concentration has increased the most by burning fossil fuels. Methane is very efficient at trapping heat and has a GWP 28 times that of CO2. Though methane’s concentration is low, it has more than doubled since pre-industrial times. There are other greenhouse gases which are more effective at trapping heat and have longer lifetimes, such as N2O, but their contributions are small because they have such low concentrations. Below is a table comparing those. Source.

Although converting coal-fired power plants to natural gas might be advantageous in the short term, we should be concerned about methane’s volatile prices, the link between fracking and earthquakes, and its GWP. Large amounts of methane are lost from fracking operations, leaking gas wells, and pipeline leaks.  If even 4% of the methane produced is lost to leaks, then any advantage of converting to methane will be lost.  The EPA has taken steps to reduce methane loss to the air, but is a very difficult thing to measure. One study found that infrastructure leaks in the Boston area accounted for about 2.6% of the methane transmitted. And methane, when burned, still ends up as CO2 in the atmosphere. You can see from the table that the amount of methane in the air is growing, and rather than count on it for the future, we should focus on converting to renewable energy sources as quickly as possible.

(C) 2016  –  J.C. Moore

Note: Here is a model of octane for the curious:

The article “Obama orders steeper cuts from power plants” described how the EPA’s proposed limits on carbon pollution could cost $8.4 billion annually by 2030. The Citizens’ Climate Lobby (CCL) has a better way, a Carbon Fee and Dividend,  which would produce  deeper cuts in pollution in a shorter time.  CCL’s proposal would place a fee on carbon at the source, and market forces would then encourage reduced emissions, energy conservation and investments in renewable energy.  The carbon fee is not a tax and it would not raise taxes. The money collected would be distributed equally to every household as a monthly energy dividend.

CCL’s legislative proposal would set an initial fee on carbon at $15 per ton of CO2 or CO2 equivalent emissions.  The fee would increase by $10 each year until the CO2 emissions were reduced to 10% of the 1990 US levels. To protect American businesses and agriculture, adjustments at the  borders would be made on exports and imports by the US State Department to ensure fairness. The carbon fees would be collected by the US Treasury Department and rebated 100% to American households, with each adult receiving a dividend and each child one half dividend up to a limit of two children per household.

A similar Fee and Dividend policy is successfully working in Canadian British Columbia. In 2008, BC enacted a revenue neutral carbon tax which set an initial rate of $10 per metric ton of CO₂ equivalent emissions, increasing by $5 per year until it reached $30, which it did in 2012. The revenue went straight back to taxpayers as tax reductions with a tax credit paid to low income households of $115.50 for each parent and $34.50 per child annually. The tax raised the price of gasoline by about $0.25 per gallon and the price of coal by about $60 per ton. Though there were winners and losers under the BC plan,  it’s GDP grew in relation to the rest of Canada’s.

British Columbia gets most of its electricity from hydroelectric power, so it is difficult to estimate the effect it had on the price of electricity. There are now no coal-fired plants in British Columbia and the consumption of fuel there is now 19% below that of the rest of Canada.

In the US, all the money collected from the carbon fee would be distributed to US households as a dividend – which would effectively stimulate the economy. President Bush’s Economic Stimulus Act of 2008 provided a $600 rebate to each household. A 2012 study by Christian Broda found the increase in disposable income was an effective stimulus to the economy. President Bush’s stimulus, however, was only for one year and the money came from taxes. CCL’s proposal does not come from taxes, and a $30 per metric ton fee on CO2 is estimated to provide about $876 annually per person in the US. Though the price of gasoline and fossil fuel generated electricity will certainly go up, it will be offset by the dividend. People who reduce their energy consumption, or choose lower cost renewables, will be able to  increase their disposable income by saving more of their dividend.

The CCL Fee and Dividend proposal has a wide range of supporters such as notable climate scientists James Hansen, Katharine Hayhoe, and Daniel Kammit.  It has the support of both conservative and liberal economists such as Gary Becker, Gregory Mankiw, Art Laffer, Nicholas Stern, and Shi-Ling Hsu. CCL’s advisory board is bipartisan as it includes George Shultz, former Secretary of State under Ronald Reagan, conservative former US Representative Bob Inglis (R-SC), and RESULTS founder Sam Daley-Harris, who is an advocate for solutions to poverty.

A study by Regional Economic Models Inc. found CCL’s proposed carbon fee and dividend would achieve better pollution reduction than regulations while adding 2.8 million jobs to the economy over 20 years.

What could be a better way to reduce carbon emissions?

(c) 2015  J.C.Moore                   

Credit: Darrel Hart, Wichita CCL leader, who helped greatly withthe editing.