We really should be using nuclear. I know people are concerned about the longevity of the waste but it's not much different than any other waste like you'd find with mining. There is enough arsenic trioxide at a mine in the NWT to kill everyone on the face of the planet 7x over. It's all underground. Their plan for it? Keep it frozen in perpetuity.
Waste rock dumps from mining can have tremendous amounts of metal that can easily leach out for a very long time given that these dumps are hundreds of millions of tonnes of rock. They are usually covered and left once monitoring indicates they are stable.
There is tons of modelling and engineering that can go into waste mgt. It shouldn't deter us when we are literally staring down the barrel or extinction