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Environment

More On Breathing And CO2

November 29, 2010 | A version of this story appeared in Volume 88, Issue 48

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James P. Hardy is simply wrong when he writes “the world's human population—people breathing—is a significant source of carbon dioxide added to our atmosphere daily.” He adds other animals as well (C&EN, Nov. 1, page 2). Human and other animal respiration does not add CO2 to the atmosphere. Every atom of carbon they place into the atmosphere by respiration was recently removed by plants in photosynthesis. The net addition of carbon is a flat zero. The additional CO2 spoken of by climate-change scientists is the currently oxidized carbon removed from the atmosphere millions of years ago and sequestered in coal, petroleum, and natural gas and only now being re-released into the atmosphere.

He suggests this might be an interesting problem for high school students. I agree, but they should follow all carbon, not just that being recycled daily from atmosphere to plant to animal and back.

Albert S. Kirsch
Bal Harbour, Fla.

Hardy’s letter concerning CO2 production from respiration is typical of the half-truths propagated by those who oppose trying to mitigate global warming. The other part, of course, is that nearly every molecule of CO2 respired is fixed by a green plant somewhere lower in the food chain from CO2 already in the atmosphere. The net CO2 production is zero.

Most people learn about the carbon cycle in seventh-grade science class. Every molecule of CO2 produced from fossil-fuel combustion is CO2 that has not been in the atmosphere for many millions of years and that we are releasing in a very short period of time.

James E. Pickett
Schenectady, N.Y.

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