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international / environment Sunday March 10, 2013 22:31 by T
Fig 1: Methane emissions from Arctic Sea Floor and Arctic Albedo
All the worry about Global Warming has tended to focus on carbon dioxide emissions but the real threat may be methane emissions.... In the past 5 years there have been major changes happening up in the Arctic. The annual summer melt of the sea ice floating on the Arctic Ocean has greatly increased, exposing a much larger area to heating during the summer months which in turn has warmed the ocean enough that the frozen methane hydrates on and below the seabed are beginning to melt, causing methane gas to bubble to the surface. The trouble is methane is up to 100 times (over initial 20 year period of release) more effective than carbon dioxide as a greenhouse gas and the estimated quantity of methane hydrates suggests the amount of carbon contained in them exceeds all the coal, oil and gas burned so far. And should the tundra melt in Siberia then the huge area of peatland will resume decomposing thereby emitting a very large quantity of carbon dioxide. This scenario would take us past extinction danger point which is reckoned for a rise of 6oCelsius or more would be close to certainty.
Related Indy Links:
Study: Arctic sea ice decline may be driving snowy winters seen in recent years
| Arctic Sea Ice Shrinking At 'Unprecedented' Levels
| Special issue on the Arctic: After the ice
| Arctic sea routes open as ice melts
| Arctic Turning into a Sea of Foaming Methane. Positive Feedback has kicked in
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