Batu Hijau, Indonesia

The dramatic eroded landscape of the second-largest open-pit copper-gold mine in Indonesia is nothing compared with the scene we cannot see on the surface. Using a submarine tailings disposal technique, each year, the mine dumps more than 40 million tons of waste (including arsenic, mercury, and cyanide) into the Indic Ocean, causing water pollution and reducing fish population especially in the Sennunu Bay.