Runaway melt: Alaska permafrost is thawing even in winter

Much of the North Slope of Alaska is characterized by low, sweeping tundra hills, and a complete absence of trees. (Creative Commons photo by Paxson Woelber)
When you think of carbon emissions, you probably think of the exhaust that comes from your car. But it comes from the ground, too. As the temperature continues to rise in the Arctic, Alaska’s melting permafrost is releasing  carbon dioxide into the Earth’s atmosphere. A new report published Monday says CO2 is  escaping