Mangroves, the tangled coastal forests that store more carbon than tropical rainforests, can recover from deforestation within a human lifetime. A new global study published in June 2026 found that abandoned mangrove plantations in Indonesia and other countries can regrow to near natural condition in 15 to 30 years. That is fast enough to matter for climate goals and coastal protection.
A 30 year window for regrowth
Researchers analyzed 40 sites across 10 countries, including Indonesia, Brazil, and Kenya. They looked at mangroves that had been cleared for shrimp farms, timber, or charcoal and then left alone. The study found that after 15 years, regrowing mangroves held about half the carbon of old growth forests. After 30 years, carbon stocks and tree height matched natural levels. The lead author, a scientist at the University of Queensland in Australia, said the speed of recovery surprised the team.
Why local communities in Indonesia care
Indonesia has lost more mangroves than any other country. Much of that loss came from clearing forests for shrimp ponds. When those ponds were abandoned, many locals assumed the land was dead. The study shows that if left undisturbed, mangroves can return on their own. That matters for villages that rely on mangroves for fish nurseries, storm protection, and firewood. In some sites in Sumatra, researchers found that regrown mangroves already hosted the same crab and fish species as untouched forests.
What the study did not find
The research did not look at replanting efforts. It only examined natural regrowth on abandoned land. That distinction is important. Many government and nonprofit projects spend money planting mangrove seedlings, often with low survival rates. The study suggests that in some cases, simply stopping the destruction and letting nature work may be more effective. The authors stressed that their findings apply only to sites where the soil and water flow have not been permanently damaged.
A measurable benchmark for restoration
The study gives governments and conservation groups a clear target. If mangroves are allowed to regrow for three decades, they can store as much carbon as forests that have never been cut. That makes mangrove restoration one of the few natural climate solutions with a predictable timeline. The researchers hope their data will help countries like Indonesia, which has pledged to restore 600,000 hectares of mangroves by 2030, decide where to focus limited resources.
