"We are engaged in an unprecedented experiment with our planet," Mann told USA TODAY. "There is still time to prevent devastating climate consequences, but the window of opportunity is shrinking."
What's especially concerning, experts say, is that "the rate of warming over the past century has no precedent as far back as we are able to look, not only hundreds or thousands, but many millions of years," according to University of Pennsylvania meteorologist Michael Mann's book "Our Fragile Moment."
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