How are human activities impacting this model of the carbon cycle as it applies to the great lakes ecosystem? a) the anthropogenic flux amounts due to changes in land use would increase. b) the checks and balances on nature versus man's activities would balance out the carbon fluxes experienced over the years. c) overall, more carbon would reach the atmosphere as the anthropogenic outputs increase and there is a decrease in vegetation. d) although anthropogenic outputs might increase due to industrialization and change in land use, that would be balanced by gross primary production.