That's just 10% what the plant emits, but Jones argues Skyonic should get credit for avoiding 220, 000 tons of carbon dioxide because it is creating products, like hydrogen, that would otherwise come from natural gas and release lots of carbon dioxide.

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An atmosphere of hydrogen and carbon dioxide on Callisto.

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Starting with two silicon wafers, Soitec machines coat the surface of one with silicon dioxide insulator and embed inside it a thin fault line of hydrogen atoms anywhere from 100 to 20, 000 nanometers below the surface, depending on customers' desired wafer thickness.

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So although the cars are technically zero emission, the process of making the hydrogen produces carbon dioxide.

BBC: Apollo's fuel-cell power legacy

This gas contains approximately 80% of the original energy content of the coal, and is a combination of hydrogen, carbon monoxide, carbon dioxide, and methane.

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The mice's consumption of oxygen and production of carbon dioxide dropped ten minutes after they began inhaling hydrogen sulphide and remained extremely low as long as the gas was administered.

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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.

ECONOMIST: Tech.view

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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