Expert calls permafrost warming in areas of Alaska 'unbelievable'

One of the world's leading experts on permafrost is sounding the alarm: Permafrost in parts of Alaska will likely start to thaw by 2070, releasing methane and accelerating climate change. Permafrost is soil that is frozen throughout the year, and has spent at least two years below the freezing point of water. It is found primarily in the Arctic, as well as in some Antarctic and Alpine regions, and researchers believe the amount of methane found in permafrost is equal to more than double the amou...