"I believe this can be commercially practical with a given concentrated carbon dioxide source such as coal plant," he says.

“我相信如果有一个集中的二氧化碳来源，就像煤电厂一样，这个生产工艺就能得到工业应用，”他说道。

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Carbon dioxide is a source of plant food.

二氧化碳是植物食物的来源。

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The conversion would turn a profit, but the conversion itself, even before the fuel is used, can be a major source of carbon dioxide emissions.

这种燃料的转化将会使得公司转亏为盈，但转化本身即使是在燃料使用之前都是二氧化碳排放的主要来源。

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The Environmental Protection Agency used its authority to regulate carbon dioxide as a source of pollution and set higher standards for power plants.

CNN: Obama needs to lay out a plan on climate crisis

Gov. Rick Perry recently quipped that the largest source of carbon dioxide is Al Gore's mouth.

NPR: Mayors Take Action as Texas Slacks on Climate

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.

FORBES: Fact and Comment