For centuries, it’s been treasured in kitchens in Asia and neglected almost everywhere else: Those glistening ribbons of seaweed that bend and bloom in cold ocean waves. Far beyond South Korea, new farms have cropped up in Maine, the Faroe Islands, Australia, even the North Sea. But even as its champions see it as a miracle crop for a hotter planet, others worry that the zeal to farm the ocean could replicate some of the same damages of farming on land. “Seaweed is not going to replace all plastic, but seaweed combined with other things can tackle single use plastic,” he said. Seaweed farms are a far cry from the rows of corn and wheat that make up monoculture farming on land.

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