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Meet the World's Biggest Polluters

The finger of blame need look no further. Just 90 companies are responsible for nearly two-thirds of all greenhouse gas emissions since the start of the Industrial Revolution in 1854, a new study from the Climate Accountability Institute found. The Colorado-based organization also found that half of all these emissions were produced just in the past 25 years. The top companies are: Chevron, Exxon Mobil, Saudi Aramco, BP, and Gazprom.