This week in science: Hot towers over warm seas

While the global impact of 8 billion people and growing is severe, the chances of a full-on human extinction in the foreseeable future are tiny—or so I’ve often argued. But a new study by a mathematician comes with a less than cheerful forecast about mass extinction events in general:

In a paper published in Science Advances, he proposes that mass extinction occurs if one of two thresholds are crossed: For changes in the carbon cycle that occur over long timescales, extinctions...

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