The Matter of Methane

The Folks at RealClimate have posted a couple interesting things about CC and methane lately.
First, is An Arctic methane worst-case scenario
http://www.realclimate.org/index.php/archives/2012/01/an-arctic-methane-worst-case-scenario/
Definitely read the whole article. However, the take away of it is:
"But the methane worst case does not suddenly spell the extinction of human life on Earth. It does not lead to a runaway greenhouse. The worst-case methane scenario stands comparable to what CO2 can do. What CO2 will do, under business-as-usual, not in a wild blow-the-doors-off unpleasant surprise, but just in the absence of any pleasant surprises (like emission controls). At worst comparable to CO2 except that CO2 lasts essentially forever."

Also, a neat online tool, "...an easy-to-play-with online model of methane in the atmosphere. "

Article about the tool:
http://www.realclimate.org/index.php/archives/2012/01/an-online-model-of-methane-in-the-atmosphere/
The tool:
http://forecast.uchicago.edu/Projects/methane.html