Cracks In The Greenhouse?
Since 1990, U.S. emissions of carbon dioxide have risen and fallen with the nation's economic output. Emissions last dropped when energy demand fell during the recession of 1991, and since then they have grown an average of nearly 2% each year, as the booming economy demanded greater use of fossil fuels. The burning of fossil fuels is the primary source of carbon dioxide, the most important of the so-called greenhouse gases, which can trap the sun's heat and lead to global warming. And the U.S. belches out 23% of the world's emission total.
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