UN says greenhouse gases at record high in 2011

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.Carbon dioxide, the chief greenhouse gas, stays in the atmosphere for 100 years. Some of it is natural, coming mainly from decomposing dead plants and animals, but scientists say the bulk of it is from the burning of fossil fuels.There have been 350 billion metric tons of carbon dioxide added to the atmosphere since 1750 and it \will remain there for centuries

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