Scientists are just beginning to pinpoint the biggest sources of methane. (Representational) One of the countries most vulnerable to climate change has also been revealed as a major contributor of methane, a greenhouse gas that's about 80 times more potent in its first two decades in the atmosphere than carbon dioxide. The 12 highest methane emission rates detected this year by Kayrros SAS have occurred over Bangladesh, according to the Paris-based company, one of several that specialize in analyzing satellite observations to locate leaks. "It has the strongest sustained emissions we've seen to date where we can't clearly identify the source," said Stephane Germain, president of GHGSat Inc, which also picked up the plumes.