Giant Holes in Siberia Are Evidence of Runaway Climate Change, Scientists Say The deep, crater-like holes may be giant methane blowholes caused by the melting of permafrost. EcoWatch / By Donna Lisenby Scientists think this mysterious crater may be a giant methane blow-hole that signals the beginning of runaway  climate change. They are calling the point … Continue reading Giant Holes in Siberia Are Evidence of Runaway Climate Change, Scientists Say