I was doing a little research, and found out that 95% of fission radioactive waste is High Level Waste. Of course this waste is very dangerous, but it emits so much energy in radiation, can't we harness it in, say, a radioisotope thermoelectric generator and hook it up to the power grid? I have heard arguments that the really radioactive stuff have short half-lives, and so disappears pretty quick. Also, i've heard that a lot of the waste is only moderately radioactive, not radioactive enough to generate much electricity, but bad enough to endanger life. Obviously I am not a nuclear physicist, and the idea is so obvious they would have done it already were it feasible. But I can't see any problem here.