You haven't worded this very clearly so it's hard to be sure what you mean, but the primary driver of climate change is currently CO2, methane emissions currently have a fraction of the effect on climate and as a result less effect on polar ice. On the flip side it's primarily the terrestrial and oceanic permafrost that are holding frozen methane and methane hydrate, not ice.Andrew_C said:Wasn't there a German study that did serious, in depth, fieldwork up in the Artic Circle? And didn't they conclude last year that as far as they can tell, the methane emissions are not linked to the decrease in ice in the Arctic Circle? I guess "Arctic methane won't kill and bankrupt everyone!" isn't such an attention grabbing headline.
Edit:
Ok, having read your source they are basically saying that these particular gas vents have been emitting methane for some time, and they do not know why exactly but probably due to long term temperature rise or due to seasonal temperature shifts, or I would imagine temperature shifts due to changes in currents and salinity. Given that the area studied is at roughly the temperature and pressure you would expect methane hydrate to become gaseous it's not exactly hugely surprising.