In October 2008, Greenpeace, World Wildlife Fund, and The Energy Foundation published The True Cost of Coal, a report that said that by-products of coal burning such as water pollution, air pollution and human costs such as mining deaths are costing China an additional 1.7 trillion yuan per year, or more than 7% of GDP. They recommended that China increase the price of coal by a tax of 23% to reflect the true costs of China's reliance on coal.[65]