Fossil fuels supply 85 percent of the primary energy consumed in the United States and are responsible for 98 percent of emissions of carbon dioxide. Eighty percent of U.S. carbon dioxide emissions come from the use of coal and petroleum fuels. Although the industrial sector is the largest energy consumer (including direct fuel use and purchased electricity), the transportation sector emits more carbon dioxide because of its near complete dependence on petroleum fuels. The residential and commercial sectors have lower emission levels than the transportation and industrial sectors, with the majority of their emissions coming from the combustion of fossil energy to produce purchased electricity.
Short answer: anything that uses power probably burns something, which makes CO2. Cars, power plants, even cooking all burn organic material like oil or coal, which makes CO2.
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