i aint to sure to be honest, i mean for the amount of power nuclear power plants realese, very little CO2 is emmited, so for preventing global warming it may help loads but like what loads of people pointed out, nuclear fission makes a load of radioactive waste which is evil and shooting it out to space would cost alot of money
i dont see why chucking it down volcanoes would be that harmful though, the lava would destroy it and chances are the radioactive stuff would end up scattered around the centre of the earth (or around that area, anyway)
Uh...Is radioactive waste being scattered around the earth a good idea..?