But most climate scientists reject the idea that this history means human-induced climate change will be benign. They add that the fossil record indicates nothing quite like today’s rapid release of greenhouse gases and its parallel effect of raising the planet’s temperature, changes that are occurring in a geologic instant.
“Absolutely, unequivocally, nature has changed before,” said Richard B. Alley, a leading climate scientist at Pennsylvania State University. “But it looks like we’re going to do something bigger and faster than nature ever has.”
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