I’m worried about nuclear because I have worked in enough large organisations with managers that will do everything to cover this ass, so as long as humans are in the mix disasters will happen.
However I reckon nuclear fission also hasn’t had a fair shake. Not nearly enough research has gone into making quality reactors that minimise the after effects and make them safer to run.
The worst part is, no matter how safe and clean they are run now, we have no way to make sure that the people running them in 20 years will be as careful. Also, the safer they are, the less people will pay attention to minor shit that adds up.