Agence France-Presse: The volume of greenhouse gases causing global warming rose to a new high last year, the UN World Meteorological Organization said Tuesday, warning it is becoming increasingly unlikely the world can limit rising temperatures to UN-backed targets. Levels of carbon dioxide (CO2) -- the single most important man-made contributor to climate change -- rose to 390.9 parts per million in 2011, which is 2.0 ppm higher than in 2010, the WMO said. Pointing out that the worst warming gases -- CO2, methane...
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