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Greenhouse Gases Rise to Record Levels in Atmosphere, WMO Says

Concentrations in the atmosphere of the three main global warming gases rose in 2012 to the highest on record, increasing impacts of climate change including ice melt and rising sea levels, the United Nations said.

Carbon dioxide, responsible for about 80 percent of the warming effect of greenhouse gases, gained 0.56 percent to 393.1 parts per million molecules of air, the UN World Meteorological Organization said today in an e-mailed bulletin. The methane concentration increased 0.33 percent and the nitrous oxide level climbed 0.28 percent.