The attempt to reduce human carbon dioxide emissions to control global warming is completely and utterly pointless and doomed to failure. Well, perhaps I should qualify that statement a bit. Reducing man made carbon dioxide emissions is completely and utterly pointless if your goal is to change the future climate. On the other hand if you’re looking to make money from the trading of carbon allowances (carbon credits) than it makes a great deal of sense. If you’re looking to control the way the modern world makes energy then it makes perfect sense as well. If you’re trying to save the world from capitalists it makes it highly desirable to reduce “dirty” carbon emissions. If your mission is to extract money from developed nations and give it to those countries that have been robbed of their right to burn fossil fuels to grow their economies then it is the moral thing to do. If you are in the renewable energy business it makes perfect sense to support the reduction of carbon dioxide “pollution”. If you’re one of hundreds of environmental corporations whos mission is to save the planet at any cost, then shutting down all sources of man made carbon dioxide is a war you must win. What cause could be nobler than to save the planet?
Earth has a thick atmosphere that provides the living things on it and in its oceans with a warming greenhouse effect. This keeps the earth’s temperature at an average of 59 degrees Fahrenheit. Had there not been greenhouse effect the average temperature of the earth would be zero degrees. Life as we know it would not likely exist. The primary greenhouse gases listed in order of their contribution to the effect are: Water vapor, carbon dioxide, nitrous oxide and methane. There are others but their concentrations in the atmosphere are so small they don’t contribute much effect. Water vapor and clouds are about 93% of the greenhouse effect. Carbon dioxide about 5%, nitrous oxide about 0.95% and methane contributes about 0.36%. It’s the combined greenhouse warming from these gases that gives the earth its current average temperature.
Studies by Raval & Ramanathan (1989) estimated that the greenhouse effect of a cloudless atmosphere is 146 W/m2 (watts per square meter) for the average earth. They further pointed out that water vapor is accounting for most of this greenhouse effect, leaving about 8 W/m2 for the total amount of atmospheric CO2, i.e. some 5%. In addition the Intergovernmental Panel on Climate changes (IPCC) 4th assessment showed that 3% of the atmospheric CO2 comes from man made sources. Global gross primary production and respiration, land use changes plus CO2 from the oceans totals 213 gigatons of carbon exchanged each year between the earth/oceans and the atmosphere. The IPCC figure also shows man made carbon emissions to be about 7 gigatons bringing the total to 220 gigatons per year. So from this we can see that making energy from fossil fuels is adding about 3% of the carbon dioxide added to the air each year. From that the total human component of the greenhouse effect is therefore about 3% of the total carbon dioxide component of the greenhouse effect which is 5%. That gives us a value of 0.1% from man made carbon dioxide. If you think that’s a small number you’re right.
The important question is how much effect does burning fossil fuels have on the temperature of the earth? The following is simplistic but makes a lot of sense to me. The average temperature of earth is 59 degrees. Carbon dioxide is 5% of the greenhouse effect so 5% of 59 degrees is 2.95 or about 3 degrees Fahrenheit. All of the carbon dioxide in the air keeps the earth 3 degrees warmer than if there were none (5% of 59 degrees). The human component of the greenhouse warming is 3 percent of 3 degrees or 0.1 degree Fahrenheit or one tenth of one degree. So our contribution to the total greenhouse effect is very small. The large exchanges of carbon that take place in nature dwarf the human contribution and will continue to do so in the future.
And yet, the United Nations Intergovernmental Panel on Climate Change (IPCC) says even this small amount of warming cause by human’s use of fossil fuels will cause dramatic warming in the future. This dramatic warming is forecast by the use of computer models which presumably much data with physics. The IPCC’s forecasts are flawed for many reasons but one significant error is the residency time of carbon dioxide in the air far into future. The IPCC claims carbon dioxide, once emitted into the air stays there for 50 to 200 years. The vast majority of studies say the residency time for carbon dioxide is more like 5 years.
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