It is simply unethical to invest in an industry that will leave the problems it creates to be dealt with for thousands of years into the future  Were humankind to stop all nuclear energy use tomorrow we, as a species, would have to deal with the repercussions of nuclear power for four times longer than human civilization has so far existed. Polluting our own age is one thing but to bequeath such a heritage to generations as yet unimagined let alone unborn. To give this some context, in the case of just one isotope, plutonium 239 – the most poisonous substance known to mankind – had the Ancient Egyptians used this as an energy source to build the pyramids we would still be dealing with it today and it would still have 235,000 years to go.