The future of energy - under the frost?

Concerns over climate change often refer to the potential thawing of the Arctic permafrost, where large-scale releases of methane could significantly accelerate global warming. Yet, at the same time, governments and energy companies are weighing up the potentially lucrative reserves of methane lying below the permafrost that covers the Siberian Continental Shelf, and extends up to 1,000 km into the Arctic Ocean.