Siberia's Climate Time Bomb: Thawing Permafrost Could Spell Disaster

Siberia's Climate Time Bomb: Thawing Permafrost Could Spell Disaster: "Gas locked inside Siberia's frozen soil and under its lakes has been seeping out since the end of the last ice age 10,000 years ago. But in the past few decades, as the Earth has warmed, the icy ground has begun thawing more rapidly, accelerating the release of methane – a greenhouse gas 23 times more powerful than carbon dioxide – at a perilous rate."