Why does our burning of fossil fuels have a major effects on the earth's carbon cycle if natural fluxes of carbon dioxide into and out of the atmosphere are still more than 10 times larger than the amount humans put in every year?

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1. Why does our burning of fossil fuels have a major effects on the earth's carbon cycle if natural fluxes of carbon dioxide into and out of the atmosphere are still more than 10 times larger than the amount humans put in every year?