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pecqror 15 janvier 2010 00:12
pecqror
J’ai trouvé ça aussi

Most carbon dioxide — about 97 percent — comes from natural sources. That’s roughly 300 billion metric tons per year of CO2 gas from breathing animals, decaying plants, forest fires, volcanic eruptions and other naturally occurring phenomena.

Human activities, like driving cars, burning coal, farming, industrial production and other practices, account for 3 percent, or about 8 billion metric tons of carbon dioxide production per year.

http://www.msnbc.msn.com/id/28074879/

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