In 200 years, humans reversed a climate trend lasting 50 million years, study says

What do scientists see when comparing our future climate with the past? In less than 200 years, humans have reversed a multimillion-year cooling trend, new research suggests. If global warming continues unchecked, Earth in 2030 could resemble its former self from 3 million years ago, according to a study published Monday in the journal Proceedings of the National Academy of Sciences finds.
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