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