According to the 2013 Fifth Assessment Report of the IPCC, the primary source of the increased atmospheric concentration of carbon dioxide since the preindustrial period results from ____________________ use, with land-use change providing another significant but smaller contribution.

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The Answer of According to the 2013 Fifth Assessment Report of the IPCC, the primary source of the increased atmospheric concentration of carbon dioxide since the preindustrial period results from ____________________ use, with land-use change providing another significant but smaller contribution.