In fact, such rate cuts would require only a fraction of carbon revenues if lawmakers also identify some significant tax breaks to go after.

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But about half of that increase came before 1940, when carbon dioxide emissions were a fraction of the level they are today.

FORBES: Fact and Comment

The declaration commits the 11 signatory nations to a goal of carbon neutrality, even though their collective carbon emissions are a tiny fraction of the global total.

BBC: Poor nations vow low-carbon path

In its prospectus, Global X Funds explains that one pound of uranium can produce more energy than 20, 000 pounds of coal with a fraction of the carbon footprint.

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We know that carbon dioxide has been a much larger fraction of the earth's atmosphere than it is today, and the geological record shows that life flourished on land and in the oceans during those times.

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