"The volume of Koch Industries' toxic output is staggering. According to the University of Massachusetts Amherst's Political Economy Research Institute, only three companies rank among the top 30 polluters of America's air, water and climate: ExxonMobil, American Electric Power and Koch Industries. Thanks in part to its 2005 purchase of paper-mill giant Georgia-Pacific, Koch Industries dumps more pollutants into the nation's waterways than General Electric and International Paper combined. The company ranks 13th in the nation for toxic air pollution. Koch's climate pollution, meanwhile, outpaces oil giants including Valero, Chevron and Shell. Across its businesses, Koch generates 24 million metric tons of greenhouse gases a year."