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Carbon dioxide (CO2) is the gas released from burning fossil fuels. It is the most significant gas contributing to global warming.

Fossil fuels are comprised largely of carbon and/or hydrocarbons. The carbon is the significant element in the reaction. It combines with oxygen to form CO and CO2 (mostly CO2). Oxidation reduction of hydrocarbons yields CO2 (carbon dioxide) and H2O (water vapor).

Human activity accounts for 30 billion (30,000,000,000) tons of CO2 added to the atmosphere each year. This exceeds the amount output by all earth's volcanoes 150 times.

CO2 is not as potent a greenhouse gas as methane (CH4) or other gasses, but we are liberating more of it than we are any others, by a wide margin.

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