Greenhouse Gases Hit Record High in 2011

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The concentration of greenhouse gases in the atmosphere hit a record high in 2011, the United Nations’ World Meteorological Organization (WMO) reported Tuesday (Nov. 20).

Chief among these is heat-trapping gases is carbon dioxide (CO2), the biggest culprit behind global warming. Carbon dioxide levels reached about 390.9 parts per million last year, which is 140 percent of the pre-industrial level of 280 parts per million and nearly 2 parts per million higher than the 2010 carbon dioxide level, according to the WMO report.

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