Mangrove forests rank among the world's most valuable coastal ecosystems, shielding communities from storms, storing vast amounts of carbon and providing nurseries for countless marine species.
For decades, scientists warned that these unique forests were disappearing faster than many tropical rainforests because of coastal development, aquaculture and pollution.
Now, new satellite observations from Nasa present an encouraging shift.
Researchers have found that mangrove forests are recovering across many parts of the world, with global gains now exceeding losses.
Yet the story is far from straightforward.
