Emission scenarios, combined with modeling of the carbon cycle, has been used to produce estimates of how atmospheric concentrations of greenhouse gases might change in the future.
A. Emission scenarios, combined with modeling of the carbon cycle, has been used to produce estimates of how atmospheric concentrations of greenhouse gases might change in the future. --- 'has been' is SV error
B. Emission scenarios, combined with modeling of the carbon cycle, have been used to produce estimates
...
A. Emission scenarios, combined with modeling of the carbon cycle, has been used to produce estimates of how atmospheric concentrations of greenhouse gases might change in the future. --- 'has been' is SV error
B. Emission scenarios, combined with modeling of the carbon cycle, have been used to produce estimates
...
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