アップロード日: 2010/02/26
In an explosive clip from the BBC's landmark series, scientists drill into a frozen lake to ignite methane gas that is trapped in bubbles beneath the surface. Do greenhouse gases pose a signficant threat to our planet? Dr Iain Stewart assesses the dangers. Watch more high quality videos on the Explore YouTube channel from BBC Worldwide here: http://www.youtube.com/bbcexplore
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