I dont find it reasonable to create uncontrolable nuclear waste only to avoid Co2. This is like chosing a kick in the balls over a soft hit with a hand.
Gen-4 fission designs are the statistically and scientifically optimum energy we have among acknowledged energy sources that push on through weather fluctuations. This is without concidering anything new that would present a greater option, (LENR, warm fusion/annialation, "pico-chemistry/hydrinos") whatever tag one wants to drop.