Melting Arctic ice can signal permafrost thaw and more greenhouse gas emissions

News Update 2: Last summer saw a record Arctic sea ice melt and another record is forecast for this year, according to a new study by the National Center for Atmospheric Research (NCAR). When the sea ice melts, the temperature over land heats up as far as 900 miles away, the study found, and is likely to thaw permafrost in Alaska, Canada and Russia. Permafrost is the long-frozen earth beneath the top layer of ground. When it thaws it releases methane, a greenhouse gas much more potent than CO2. It also can cause the collapse of infrastructure, such as highways, houses, oil rigs and pipelines. Last August-October the temperature over land in the west Arctic was unusually warm, more than 4 degrees Fahrenheit above the average for 1978-2006. Rapid sea ice thaw could lead to rapid permafrost thaw, the scientists said. (Source: Reuters PlanetArk)