Reducing emissions is a good goal, but energy needs will continue to increase even as we decrease the number of tons of carbon dioxide per kWh. As the population increases and becomes more wealthy there's not much we can do but put out more carbon dioxide; that's one of the reasons people bent on lowering world population and wealth have attached themselves to the environmental movement.

If the stigma against nuclear power goes away, or the technological issues which make speculative energy sources like wind/solar/fusion unprofitable are resolved, we could see a bigger dip but even then the century-long trend will probably be one of increase. SRM is the most realistic way I can think of to head off serious disasters until then.