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Drilling for ice - Horizon - BBC

Professor Richard Alley reports from Greenland on the biggest climate change study since the last ice age. By drilling down into the ice scientists are able to chart the temperatures of the last 100,000 years, and the results are somewhat surprising. Fascinating clip taken from the BBC Horizon programme Big Chill. Watch more high quality videos on the BBC Worldwide YouTube channel here: http://www.youtube.com/bbcworldwide
Length: 03:21

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