Bacteria chew up carbohydrates in the wastewater, producing carbon dioxide.

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Auto engineers and climate scientists say that to understand that, you have to realize that producing carbon dioxide is unavoidable if you want to use a modern engine to power your car.

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So given all the things the Sheppards are doing, how much carbon dioxide are they producing?

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Nevertheless, many environmentalists fiercely resist any moves to ease arbitrary, prohibitive barriers to the construction of the best non-carbon-dioxide-producing energy source of all: nuclear power plants.

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Mr. CHRIS BASKIND: Everything seems to be being reduced to how much carbon dioxide am I producing, or what kind of greenhouse gases we should be finding a way to sequester.

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At the same time fisheries and vital marine ecosystems like coral are being decimated, the oceans continue to provide vital services, absorbing up to one third of human carbon dioxide emissions while producing 50% of all the oxygen we breathe.

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The gas is then fed into a stack of solid oxide fuel cells, where a chemical reaction between hydrogen and oxygen occurs, producing electricity, water vapor and a tiny amount of carbon dioxide.

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The 275-megawatt demonstration plant is designed to prove the feasibility of producing electricity and hydrogen from coal, while simultaneously capturing the carbon dioxide and sequestering it in deep underground reservoirs.

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Because producing a requisite amount of electricity from gas results in estimate about 50% of the carbon dioxide for the same coal-based electricity, the only way to meet the proposed standard is to capture the outgoing carbon dioxide, pipe it somewhere, and bury it.

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