Seaweed is taking over coral reefs. But there's a gardening solution – sea-weeding

Roxana Caha, CC BY-NC-ND

In the early 1990s, marine researchers in the Caribbean found something alarming. On reef after reef, corals were dying off – and seaweed was growing in their place.

Since then, this pattern has been observed on reefs around the world: as corals die, seaweed takes over.