The government of Indonesia lifted a ban this month on the export of dredged sand that was in place for more than 20 years, in a move it claims will bring in badly needed revenue but that activists say will further degrade the country’s vital marine ecosystems.

The regulation was signed by President Joko “Jokowi” Widodo on May 15 and took effect on the same date. It allows mining permit holders to collect and export sea sand provided domestic needs have been met.

The approved uses for the sand include land reclamation and private and state infrastructure development.

While miners welcomed the decision, environmentalists have slammed the policy, warning that it will lead to an increase in sand extraction, which they say will be detrimental to coastal dwellers dependent on ocean ecosystems.

“This reveals the true face of President Joko “Jokowi” Widodo, who doesn’t care too much about protecting the sea and fishermen,” Parid Ridwanuddin, a spokesperson for the Indonesian Forum for the Environment (Walhi), told The Jakarta Post on Monday.

Parid said sand dredging had caused a number of islands in the Thousand Islands regency north of Jakarta and the Riau Islands to disappear below the water, in addition to the 0.8 to 1 meter that was lost to rising seas each year. Many more islands were now at heightened risk because of the new regulation, he added.

Sea mining also harmed marine ecosystems and drove fish from the surrounding waters, forcing local fishermen to sail further away, which would be more costly and dangerous, said Parid.

He said he expected Singapore would be one of the countries to benefit most from the policy, as demand for sand for reclamation projects was still quite high in the city-state.

Before the ban took effect in early 2007, more than 90 percent of Singapore’s sand imports were from Indonesia, which at that time provided the city-state with between 6 and 8 million tonnes of sand, according to the Singaporean government.

Greenpeace Indonesia sea campaigner Afdillah told the Post on Monday that the regulation was an attempt at greenwashing, as the government was treating sand exports as a conservation activity to control sea sedimentation.

Afdillah said this “fast and easy shortcut” to revenue would “violate the rights of ecosystems, coastal societies and fishermen”.

A lack of proper supervision from the government would lead to even greater damage to the environment, he added.

Wahyu Muryadi, a special staffer for the Maritime Affairs and Fisheries Ministry, defended the policy. He said on Monday that the policy would bring benefits to the country in the form of revenue, as quoted by tirto.id.

He also claimed the regulation would ensure that the extraction of sand and other ocean sediments was done with tools that were much safer for the environment than under the pre-ban regulatory regime.