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. 1997 Aug 5;94(16):8314–8320. doi: 10.1073/pnas.94.16.8314

Figure 4.

Figure 4

IPCC estimates of past anthropogenic forcing changes (17). Non-CO2 GHG forcing is the sum of the effects of CH4, N2O, halocarbons, and tropospheric and stratospheric ozone. Aerosol forcing combines direct and indirect sulfate effects and aerosols from biomass burning.