ClimateWire: A massive release of methane from the Arctic seafloor would have catastrophic impacts on the world's economy, possibly costing $60 trillion or more because of associated problems such as sea-level rise and drought, according to a comment published yesterday in Nature.
The $60 trillion -- roughly the size of the entire global economy last year -- considers a 50-gigaton belch of the greenhouse gas over a decadelong period from the East Siberian Sea, where scientists in recent years discovered perforations...