“Last month, UAF researcher Katey Walter brought a National Public Radio crew to Alaska’s North Slope”
They don’t need masks, they’re used to inhaling and exhaling pure methane.
The greatest methane producer I have encountered was when I was stationed at Aberdeen Proving Grounds in Maryland in the late 1950's. I could not get my Lone Star beer so I tried ROLLING ROCK. This brew turned me into the complete brass section of a marching band. The attached video is the evidence of my claim:
http://www.youtube.com/watch?v=uXAGM4z6ASA