For the first time in recorded history, mangrove forests worldwide are in net growth. A 40-year NASA satellite study published in Science found that gains have been outpacing losses for over a decade — reversing the collapse that defined the 20th century.
A Turning Point Hidden in Satellite Data
For most of the 20th century, mangrove forests were vanishing. Coastal development, aquaculture, and agriculture chewed through some of the most productive ecosystems on Earth — the nurseries of the sea, the storm shields of coastlines, the carbon vaults of the tropics.
In June 2026, a study published in the journal Science changed the story.
Researchers at Tulane University, using four decades of NASA satellite data, found that mangrove forests worldwide are no longer in net decline. Since 2010, gains have outpaced losses. For the first time in recorded history, the world's mangroves are — overall — growing back.
>> "After decades of loss, we're finally seeing a global turning point for mangroves."
— Dr Zhen Zhang, Tulane University
What the Numbers Show
Between the 1980s and 2023, total global mangrove area declined by just about 1% — a fraction of what previous estimates had suggested. In the last 13 years of the study, gains consistently exceeded losses, driven by natural regeneration and active restoration programmes.
Mangroves expand naturally along coastlines where conditions allow — advancing into newly formed mudflats, recovering after deforestation slows, recolonising degraded shorelines. Where human pressure has eased, they return.
Why Mangroves Matter More Than Almost Anything
Mangroves are among the most carbon-dense ecosystems on Earth — storing up to four times more carbon per hectare than tropical rainforests. They protect coastlines from storms and sea-level rise. They are the nurseries where 80% of the world's commercial fish species begin their lives.
Losing them is catastrophic. Getting them back is one of the clearest wins the ocean and the climate can share.
The Threat That Remains
Sea level rise, if it accelerates beyond certain thresholds, risks drowning mangroves faster than they can migrate landward. Their carbon stores, built over centuries, could be released in decades.
But the trajectory is real. The loss is slowing. In many places, it has reversed. Forty years of satellite data do not lie.
>> "This is not the end of the story. But it may be the end of the beginning."