Methane release - higher than expected

From the BBC website:

"Scientists have uncovered what appears to be a further dramatic increase in the leakage of methane gas that is seeping from the Arctic seabed. Methane is about 20 times more potent than CO2 in trapping solar heat. The findings come from measurements of carbon fluxes around the north of Russia, led by Igor Semiletov from the University of Alaska at Fairbanks."

See http://newsvote.bbc.co.uk/1/hi/sci/tech/8437703.stm