ClimateWire: Abrupt climate change within a decade triggered by runaway melting of Arctic permafrost is extremely unlikely, according to a study published in Nature yesterday. Rather, the permafrost, or frozen ground, in the Northern Hemisphere will take decades or centuries to melt and release the carbon stored in the soil. The release will not trigger a catastrophe per se but will exacerbate global warming. "These are large and significant releases, so, over a century, we are going to release 100 billion...