In the United States in 2010, estimates show that about four tons of carbon dioxide were released into the atmosphere per vehicle, according to AmericanForests.org. In that same year, the Department of Transportation notes that the South-Gulf experienced the largest jump in traffic volume among all regions.
In 2013, motor vehicles produced about 50 percent of the carbon dioxide and nitrogen oxide emitted into the air, as stated by the Union of Concerned Scientists. Additionally, between 1990 to 2012, transportation accounted for 28 percent of all greenhouse gas emissions, as claimed by the Environmental Protection Agency. The EPA also notes that the biggest producer of carbon emissions is the power sector.