Borneo has 15,000 plants (6,000 endemic). There is an area of 6.5 hectares that contains more than 700 species of trees, a huge amount if we compare it with a similar forest in northern Europe, with only about 50 species. The mangrove grows in coastal regions. With an estimated area of 1.2 million hectares, it only occupies 20% of its original extension. The peat swamp forests covered more than 10 million hectares in 2002. The logging and other intervention processes of the land to plant palm oil caused the peat to decompose rapidly, releasing potent greenhouse gases into the atmosphere. The mountain or montane forests of Borneo occupy the high areas of the island. In 2002 it was estimated that about 70% of the original mountain forests remained. The forests of dipterocarps are the most biodiverse of Borneo, although they are also the most threatened. More than half of the original area covered by this ecosystem has been deforested in Malaysia, and about two thirds in Indonesia.