How much more carbon dioxide is in the atmosphere than there was 150 years ago, and how did it get there?
The concentration of carbon dioxide (CO2) in Earth's atmosphere is approximately 391 ppm (parts per million) by volume as of 2011. Natural sources of atmospheric carbon dioxide include volcanic outgassing, and the respiration processes of living aerobic organisms; man-made sources of carbon dioxide include the burning of fossil fuels for heating as well as some industrial.
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About Carbon Dioxide
Carbon dioxide is a chemical compound composed of two oxygen atoms bonded to a single carbon atom. CO2 is increasing due to the burning of fossil fuels, leading to global warming. Carbon dioxide is often confused with carbon monoxide.
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