Remember when warm weather was supposed to melt the permafrost, unleash the methane, and turn the Earth into an uninhabitable fireball? Never mind

BBC News - New theories over methane puzzle

Scientists say that there has been a mysterious decline in the growth of methane in the atmosphere in the last decades of the 20th Century.

2005: Racing Toward Climate Disaster - IPS ipsnews.net

The melting of millions of square kilometres of permafrost will unleash billions of tonnes of methane, the U.S. National Center for Atmospheric Research (NCAR) reported in the Dec. 17 issue of Geophysical Research Letters.

Methane is a greenhouse gas that is 20 times more potent than carbon dioxide, and will dramatically accelerate global warming. A major permafrost meltdown will have a major impact on climate, NCAR scientists said.