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Transportation sources (cars, trucks, etc.) emit approximately 29 percent of total U.S. greenhouse gas (GHG) emissions in 2006. Transportation is also:

  • the fastest-growing source of U.S. GHGs, it produced 47 percent of the net increase in total U.S. emissions since 1990.
  • the largest user source of carbon dioxide (CO2), the most common greenhouse gas.
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Q: What percentage do vehicles contribute to global warming?
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