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UN says greenhouse gases at record high in 2011

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GENEVA (AP) — The main global warming pollutant reached a record high level in the air in 2011, the U.N. weather agency said Tuesday. Concentrations of heat-trapping carbon dioxide in the atmosphere averaged 390 parts per million during the year. That is up 40 percent from before the Industrial Age, when levels were about 280 parts per million, the World Meteorological Organization said....