Wealthy countries are exporting millions of tons of plastic waste to Southeast Asia, where local recycling systems cannot process all of it. Greenpeace and the Global Alliance for Incinerator Alternatives, or GAIA, studied the issue. Their joint investigation found that the exports of plastic waste are causing widespread pollution problems. In early 2018, China banned the import of plastic waste for recycling. The ban sent the international trade in recycled materials into disorder. Greenpeace and GAIA workers gathered information from the top 21 importers and exporters of plastic waste. They looked at the recycling trade before and after the Chinese ban. Over half of the plastic, more than 3 million tons a year, used to go to China. It is now being sent to Southeast Asia. Huge mountains of plastic are growing in Thailand, Malaysia and Vietnam, among other countries.