In a coastal village on the Indonesian island of Sumatra, an oil palm and pineapple grower named Harisyah is fighting rapid coastal erosion.

The region’s northern coastline, which sits on carbon-rich tropical peat soils, is losing ground to the sea at a rate of more than 6 meters (20 feet) annually. Researchers attribute the retreat to a combination of subsiding drained peatland and the loss of mangrove forests cleared for charcoal production, aquaculture, and oil palms.

Harisyah’s hands-on activism began in 2011 after he attended an aquaculture training course in the Meranti Islands, off the eastern coast of Sumatra, reports contributor Suryadi for Mongabay Indonesia. He spent the next few years learning how to restore mangrove forests, from raising seedlings to organizing community volunteers.

In 2018, when he became the head of Tanjung Kuras village, on the Sumatran mainland, he used local funds to kick-start mangrove restoration efforts around his village. In 2024, after leaving office, he partnered with local and international nonprofits to scale up restoration in Tanjung Kuras, aiming to revive 25 hectares (62 acres) of degraded mangrove forest.

A key part of Harisyah’s current strategy is involving local youths to ensure long-term stewardship. One of the restoration sites is near an elementary school, and local schoolchildren and residents joined him to plant seedlings along the riverbanks.