Here's your original link, DA. It was in my watched topics email:

http://www.sciencedaily.com/releases/2007/03/070320103826.htm

From this link:

"Also, emissions from methane ? the second most important greenhouse gas ? may significantly rise in the future due to global warming if methane is released from currently frozen permafrost areas."

In another Climate Change Forum thread, I recall asking someone whether he had any thoughts on Siberian tundra methane gas. He ignored the question. Maybe he thought I was being facetious...but it really does threaten to snowball (an unfortunate word) the problem.

"Time is what prevents everything from happening at once" - John Wheeler