Until a few decades ago, reefs near Sydney, Australia were covered in brown, sinuous macro-algae called Phyllospora comosa, or crayweed. Then Sydney dumped a bunch of sewage in the ocean in the 1970s and 1980s and killed most of it off. Reefs were barren at worst; at best, they were covered in simpler algae. But a group of scientists just tried transplanting a new crop of crayweed onto the reefs, like giving them hairplugs. And it worked.
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