Mangroves Are Making a Comeback—and It's Changing Everything

For decades, mangrove forests have been disappearing faster than nearly anyone was paying attention. Coastal development, aquaculture operations, and the simple fact that few people want to wade through mud and humidity for a nature walk meant these ecosystems kept losing ground. But something unexpected is happening now: they’re coming back—and stronger than before.

A landmark study published in Science by researchers from Tulane University reveals that mangrove forest destruction hasn’t just slowed down over the past 20 years. It’s actually reversed. The world now has more mangrove coverage than it did at the turn of the century, and the forests that remain are becoming denser and healthier. What was once a conservation nightmare is quietly turning into a success story.

The turnaround didn’t happen by accident. It took a catastrophe to change hearts and minds. During the 2004 Indian Ocean tsunami, Indonesia became an unintended laboratory for understanding mangroves’value. Some Indonesian islands that still had their mangrove forests were protected from the worst devastation, while islands where those forests had been cleared suffered far greater damage. That stark contrast woke people up. As lead author Dr. Zhen Zhang told the BBC,“Some islands were covered by mangroves and after the tsunami those islands were [still] protected very well, so that increased public awareness about the importance of protecting mangroves.”Suddenly, what seemed like worthless swampland was recognized as coastal infrastructure worth preserving.

The numbers tell the story. Between the 1980s and 2010, the world lost nearly 1,120 square miles of mangroves. But since 2010, gains have outpaced losses. By 2023, the net loss over the entire four-decade period had shrunk to just 1%—far less than previously estimated. What’s more, the forests themselves are changing. Closed-canopy mangrove forests, which store significantly more carbon and provide stronger protection against storms and storm surge, have expanded globally over the past 40 years. Degradation rates have dropped dramatically since the 1980s, reflecting the real impact of conservation policies and restoration programs taking root worldwide.

Daniel Friess, Cochran Family Professor of Earth and Environmental Sciences at Tulane and director of The Mangrove Lab, called it“a real shift.”He noted that while some mangroves are still being lost,“Mangroves are now showing a net increase globally, and the rate of degradation is slowing.”For a planet that’s grown accustomed to hearing about ecosystem collapse, that’s the kind of news worth celebrating—and protecting.

What makes this resurgence particularly remarkable is what mangroves actually do. They absorb up to five times more carbon than terrestrial trees, filter pollutants and excess nutrients with exceptional efficiency, and serve as nurseries where fish, invertebrates, and crustaceans can grow and feed safely. They’re among Earth’s most effective environmental stewards, quietly working in the background while people focus their conservation efforts elsewhere. The fact that we’re finally recognizing their value—and acting on it—suggests that even late-arriving conservation efforts can turn the tide.