UN:
Greenhouse gases in the Earth’s atmosphere have reached new record highs and show no sign of leveling off, the UN weather agency said Tuesday.
The report by the World Meteorological Organization was released a year before representatives from major countries meet in Denmark to negotiate a new international treaty to curb greenhouse gases for 2012 and beyond.
The gases—carbon dioxide, nitrous oxide and methane—are produced partially by natural sources, such as wetlands, and partially by human activities such as fertilizer use or the combustion of fossil fuels.
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