If an anthropogenic thermal anomaly this century will eventually (and inexorably) propogate to and destabalize
significant amounts of methane hydrates in future centuries — shouldn't this be a consideration for policy makers?
However, as the ESAS was only inundated by the sea about 8,000 years ago it would be highly unlikely to find that about 1.5 km thick subsea permafrost layer would have decomposed sufficiently by the Holocene Optimum to have
allow significant amount of methane to leak through it.
The warming Arctic could
add significant amounts of methane gas to the atmosphere as permafrost melts and releases huge quantities of gas trapped in previously frozen ground.
While hydroelectricity usually does not produce as much carbon as burning fossil fuels, studies have shown that dams, especially those in the tropics,
emit significant amount of methane — a greenhouse gas which is approximately 20 times more potent than carbon — due to rotting vegetation in reservoirs.
Fracking, or hydraulic fracturing operations, by the oil and gas industries can emit
significant amounts of methane.