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A seabed mining startup, DeepGreen Metals Inc., has successfully sold itself to investors as a game-changing source of minerals to make electric car batteries that can be obtained in abundance—and at great profit—while minimizing the environmental destruction of mining on land. But there’s strong scientific evidence that the seabed targeted for mining is in fact one of the most biodiverse places on the planet—and increasing reason to worry about DeepGreen’s tantalizing promises.