Melting Permafrost (Part 4)

Russian scientists have recently found more new craters in Siberia, apparently formed by explosions of methane. Three were found last summer. They looked for more using satellite photos… and found more!

���What I think is happening here is, the permafrost has been acting as a cap or seal on the ground, through which gas can���t permeate,��� says Paul Overduin, a permafrost expert at the Alfred Wegener Institute in Germany. ���And it reaches a particular temperature where there���s not enough i...