2011 Atmospheric CO2 New Record 390.9 ppm; CH4, N20 Also At New Records
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 1813 parts per billion (ppb) in 2011, and nitrous oxide rose to 324.2 ppb. All told, the amount of excess heat prevented from escaping into outer space was 30 percent higher in 2011 than it was as recently as 1990.
These are sobering numbers, not because they come as any sort of surprise, but rather because they don’t. Scientists have known about the heat-trapping properties of CO2 since the mid-1800s. They’ve been documenting the steady rise of CO2 pumped largely out of smokestacks and exhaust pipes since the 1950s.
About half of the excess CO2 going into the atmosphere so far has been absorbed by plants and the oceans, but, said WMO Secretary-General Michel Jarraud in a press release, “ . . . this will not necessarily continue in the future” as these natural “sinks” for CO2 reach their capacity.
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http://www.climatecentral.org/news/co2-hits-new-high-world-could-warm-7f-by-2060-15268
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