Carbon dioxide, the primary greenhouse gas emitted by human activities, reached 390.9 parts per million last year, or 40 percent above the pre-industrial level, the World Meteorological Organization said. It cited fossil fuel as the primary source.
Atmospheric volumes of greenhouse gases blamed for climate change hit a new record in 2011, the World Meteorological Organization (WMO) said in its annual Greenhouse Gas Bulletin on Tuesday.
See full Article: http://www.csmonitor.com/Environment/Latest-News-Wires/2012/1120/Why-greenhouse-gases-hit-record-high-in-2011
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