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    Sources and Sinks: What drives long-term climatic trends?

    For the entire history of our species, humans have lived on a planet capped by a chunk of ice at each pole. But Earth has been ice-free for about 75 percent of the time since complex life first appeared. This variation in background climate, between partly glaciated and ice-free, has puzzled geologists for decades.

    from Top Environment News -- ScienceDaily https://ift.tt/2u6RQeP

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