Edited sentence: Advocates of nuclear power point out that it is a cost competitive way to produce energy versus fossil fuels, especially if you take into account fossil fuel externalities, the same way nuclear reactors have to pay for their pollution and plant decommissioning costs.Coal and hydropower has caused many more deaths per energy unit produced than nuclear.If energy becomes scarce, this could be important.Nuclear energy gives more energy per input energy than many other energy sources.Nuclear waste takes up little space compared to wastes from the chemical industry which remain toxic indefinitely.Using life cycle analysis, it takes 4-5 months of energy production from the nuclear plant to fully pay back the initial energy investment