The global population stands to benefit from increased carbon dioxide in the atmosphere because it boosts agricultural productivity, writes Harrison Schmitt, a University of Wisconsin-Madison engineering professor, and William Happer, a Princeton University physics professor. Global warming has slowed over the past few years, and this shows how little it is connected to the rise in carbon dioxide concentrations and how overblown are some forecasts of human-caused warming. "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," the professors write.

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