Excerpt for SLATE:
"The carbon from the gasoline mixes with oxygen from the air. Gasoline consists mostly of hydrocarbons–chains of carbon encircled by atoms of hydrogen. When the hydrocarbons burn, they break apart and recombine with the air. This reaction produces heat, as well as two chemical byproducts: water and carbon dioxide."
Complete article:
http://www.slate.com/articles/news_and_politics/explainer/2006/11/how_gasoline_becomes_co2.html

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Denny G
Sandwich, IL