100 yard holes open up in Siberia: Climate Change and Methane are the cause

http://www.businessinsider.com/solved-mystery-siberian-craters-climate-change-2016-3?r=US&IR=T

It is a short video that explains the methane under the Permafrost and as the Permafrost melted because of warming weather the pressure blew the ice and permafrost to open up the holes.  It is a scary look at the future.  As the ice melts and water/ air warms - more methane goes into the atmosphere.