We need phosphate to grow food. But should we be digging it up from the sea floor?

The view from the sleepy town of San Juanico, Mexico, is about what you’d see from any village along the Pacific coast of Baja California — craggy coves, turquoise waves, a couple of surfers and fishing boats. But 25 miles offshore, there’s something different. The sediment at the bottom of the sea out there is rich…

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