The New Yorker
Abstract:
A reporter at large about the sixth mass extinction. Describes how graduate student Karen Lips observed the mysterious disappearance of large numbers of local golden frogs, in the nineteen-nineties, at several locations in Panama and Costa Rica. Whatever was killing Lips’s frogs moved east, like a wave, across Panama. Of the many species that have existed on earth, more than ninety-nine per cent have disappeared. Yet extinction has been a much contested concept. Throughout the eighteenth century, the prevailing view was that species were fixed. Charles Darwin believed extinction happened only slowly, but he was wrong. Over the past half billion years, there have been at least twenty mass extinctions. Five of these—the so-called Big Five—were so devastating that they’re usually put in their own category. The fifth, the end-Cretaceous event, which occurred sixty-five million years ago, exterminated not just the dinosaurs but seventy-five per cent of all species on earth. Once a mass extinction occurs, it takes millions of years for life to recover, and when it does it’s generally with a new cast of characters.
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