Climate Central: The amount of heat-trapping carbon dioxide in the atmosphere reached a record 390.9 parts per million (ppm) in 2011, according to a report released Tuesday by the World Meteorological Organization (WMO). That's a 40 percent increase over levels in 1750, before humans began burning fossil fuels in earnest. Although CO2 is still the most significant long-lived greenhouse gas, levels of other heat-trapping gases have also climbed to record levels, according to the report. Methane, for example hit...
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