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To Predict Effects Of Global Warming, Scientists Looked Back 20,000 Years

03:17
As the climate warms, drought is killing large numbers of trees in California. Scientists are looking to the past to try to understand how the ecosystems of today may be changing. (Getty Images)
As the climate warms, drought is killing large numbers of trees in California. Scientists are looking to the past to try to understand how the ecosystems of today may be changing. (Getty Images)

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