Sitting on a Cliff Vs. Falling Off a Cliff

The Steller's sea cow is gone. This mega-manatee swam the North Pacific for millions of years, and then in the 1700s humans hunted them to extinction. Today on the front page of the New York Times, I write about a warning from a team of scientists that if we keep on doing what we're doing now--industrializing the ocean and pouring carbon dioxide into the atmosphere in greater and greater amounts--a lot of other marine animal species will go the way of the Steller's sea cow.

Yet this story is actually a fairly hopeful one. The scientists compared the pace of extinctions at sea to those on land and found that ...

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