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Global Greenhouse Gas Levels Hit New Record

On Tuesday the United Nations World Meteorological Organization (WMO) reported in its Greenhouse Gas Bulletin that the volume of atmospheric greenhouse gases hit a new record in 2011. Carbon dioxide, the principal greenhouse gas, reached a level of 390.9 parts per million (ppm) in 2011, or 140 percent of pre-industrial levels. The WMO estimates that since 1750 about 413 billion…

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