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Vehicle exhaust is mostly carbon dioxide, with a little water, carbon monoxide, hydrocarbons, and nitrogen oxides. This answer deals with the carbon dioxide content only.

Sixteen percent (16%) of human carbon dioxide greenhouse gas emissions comes from road transport (cars, trucks and buses). Cars are responsible for about half of this (8%).

Humans are responsible for around 35 billion tonnes of carbon dioxide emissions every year.


Car emissions, 8% of that total, is around 2.8 billion tonnes of carbon dioxide (2,800,000,000).


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