The fact is nuclear power is extremely safe and is getting better all the time. Gen IV reactors which could be built commercially by 2040 will produce waste that takes decades rather than millenia to decay, will produce 100-300 times the energy from the same amount of fuel, and will be dramatically safer. The way nuclear plants are being designed currently, there is essentially zero risk of a meltdown or chance for a radioactive catastrophe.
Hydro-electric screws with ecosystems :/ Take the Colorado River for example.
Wind and Solar and Turbines in water where ocean currents are strong etc are great, and should be pursued as well.
But nuclear is the obvious choice for a baseline source of power. Especially because there is still dramatic room for improvement.
All the reactors that we have had problems with (Chernobyl, Three Mile Island, Fukushima and others) have been Gen I reactors built over forty years ago. They are nowhere near as safe as new reactors (I believe current reactors are Gen III).