Environmental activists urged the government to drop its plan to boost coal exports from Kalimantan, as it would not only contribute to greater carbon emissions but would endanger the island’s biodiversity.

A recent report released by Greenpeace entitled “Point of No Return” shows that the country’s plan to massively expand coal exports from Kalimantan, which would add 460 million tons of carbon dixoide a year by 2020, would bring serious harm to local tropical forests.

Greenpeace Indonesia climate and energy campaigner Arif Fiyanto said that Indonesia would rank number four in the world’s carbon dioxide emission polluters in 2020, should the government press ahead with its plan to increase coal production to 500 million tons per year.

The country ranked number 12 in 2008.

“Indonesia produced around 390 million tons of coal last year and the count...