The Sundarbans Fights Back: Inside the World's Largest Mangrove Restoration Push

Ten thousand hectares of degraded mangrove are being replanted across the Bangladesh Sundarbans in a five-year programme that scientists say could become a global template for coastal defence. At first light on the Pashur river, the new forest is barely knee-high. Row after row of keora and baen saplings stretch across a mudflat that, three years ago, was bare silt — stripped by cyclones, shrimp ponds and the slow poison of rising salinity.

The programme, coordinated by the Forest Department with support from international climate funds, pairs satellite mapping with something older and harder to engineer: the knowledge of the people who live at the forest's edge.

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A wall you can grow

Mangroves are the rare infrastructure that appreciates in value. Studies of Cyclone Sidr in 2007 found that villages sheltered behind healthy mangrove belts recorded significantly less damage and loss of life than exposed settlements nearby. Engineers estimate that every kilometre of mature mangrove can knock 30 to 40 centimetres off a storm surge.

“An embankment cracks a little more every year. A forest gets a little stronger. That is the whole argument, and the sea keeps making it for us.”

The economics extend below the waterline. Mangrove root systems are nurseries for the fisheries on which coastal households depend, and the sediment they trap raises land elevation — a quiet counterweight to sea-level rise that no seawall can offer.

Carbon that counts

Mangrove soils store carbon at three to five times the density of terrestrial forests, which has put “blue carbon” at the centre of the project's financing. Verified credits from the restored blocks are expected to flow back into village conservation funds.

• 10,000 hectares of degraded forest targeted for restoration by 2031
• 28 native species being planted, matched to salinity zone by researchers
• 540,000 people across three districts inside the protection zone
• 4x the carbon density of an equivalent terrestrial forest

The hard part

Restoration ecologists are blunt about the failure rate of mangrove planting schemes worldwide: projects that ignore hydrology, or plant single species in neat rows, tend to die within five years. The Sundarbans programme is trying to avoid that fate by restoring tidal channels first and letting natural regeneration do much of the work.

For now, on the Pashur mudflats, the argument is being made one sapling at a time — by women's cooperatives who earn a wage today for a forest their grandchildren will need.