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Articles on Sediment cores

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Recent heat waves underscore Earth’s new climate state. Sean Gladwell via Getty Images

Is it really hotter now than any time in 100,000 years?

Long before thermometers, nature left its own temperature records. A climate scientist explains how ongoing global warming compares with ancient temperatures.
The muck that’s been accumulating at the bottom of this lake for 20,000 years is like a climate time capsule. Christopher R. Moore

New evidence that an extraterrestrial collision 12,800 years ago triggered an abrupt climate change for Earth

Why did Earth’s climate rapidly cool 12,800 years ago? Evidence is mounting that a comet or asteroid collision is to blame, with new support coming from the bottom of a South Carolina lake.

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