From what I know, nuclear power sounds like a good option. It has potential for life threatening accidents but if used properly it generates a lot of cost effective energy and creates very little greenhouse gas emissions, the main form of pollution that is a red flag for fossil fuel based energy.
It does generate harmful waste but this might be a good tradeoff compared to greenhouse gas emissions. If nuclear energy did become the dominate form of energy generation, a lot of work would have to be done in managing this waste.
From what I have read and understood, new technology could make reactors much safer and they would also be able to use recycled nuclear waste which would cut down on the total radiation that has to be stored long term. For example, the design of pebble bed reactors makes meltdowns impossible. If the temperature gets too high the nuclear fission reactions shut down all on their own.
Pebble-bed reactor - Wikipedia
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