About 85 percent of the world’s carbon dioxide emissions come from fossil fuels, and about 80 percent of those come from just two sources: coal (46 percent) in its various forms, including anthracite and lignite; and petroleum (33 percent) in its various forms, including oil, gasoline, and propane. Coal and petroleum are used differently. Most petroleum is consumed by individuals and small businesses as they heat their homes and offices and drive their cars. By contrast, coal is mainly burned by heavy industry: coal produces the great majority of the world’s steel and cement and 40 percent of
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