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Scientists core into California's Clear Lake to explore past climate change

One of the oldest lakes in the world, Clear Lake in northern California has deep sediments that contain a record of the climate and local plants and animals going back perhaps 500,000 years. Scientists are drilling cores from the sediments to explore 130,000 years of this history and fine-tune models for predicting the fate of today's flora and fauna in the face of global warming and pressure from a growing human population.
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