Drilling into the past

Tuesday, December 4, 2007

During the past two years, scientists in Antarctica have drilled more than 4,215 feet into the Earth's core and more than 20 million years back into its sedimentary history in an effort to understand how the planet's climate has changed through geologic time. The object of their search this year, evidence of the changes that occurred 14 and 15 million years ago, has been called the Rosetta Stone of global climate change.

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