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Was Earth already heating up, or did global warming reverse a long-term cooling trend?

  • Written by Ellie Broadman, Postdoctoral Research Associate in Climate Science, University of Arizona
Was Earth already heating up, or did global warming reverse a long-term cooling trend?Natural records suggest a cooling trend was underway thousands of years ago.DeAgostini/Getty Images

Over the past century, the Earth’s average temperature has swiftly increased by about 1 degree Celsius (1.8 degrees Fahrenheit). The evidence is hard to dispute. It comes from thermometers and other sensors around the world.

But what about the...

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