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I suggest that you read the carbon cycle series put out by the earth observatory section of NASA (see link above). If you had done this, you would have found out that instead of human activity emitting only a "fractional amount" of CO2 when compared to volcanoes as you claim; humans actually are responsible for injecting 100-300 TIMES MORE than volcanoes, due primarily to coal combustion, which releases far more geologically sequestered carbon into the atmosphere than volcanoes do.