Climate Desk: It was a stunning figure: $60 trillion. Such could be the cost, according to a recent commentary in the journal Nature, of the release of methane from thawing permafrost beneath the East Siberian Sea, off northern Russiaa figure comparable to the size of the world economy in 2012. More specifically, the paper described a scenario in which rapid Arctic warming and sea ice retreat lead to a pulse of undersea methane being released into the atmosphere. How much methane? The paper modeled a release...