I completely disagree. Using waste repositories like the one Finland is opening soon [1] keep the radiation out of the biosphere for well beyond the time it is dangerous. One soda can of nuclear fuel can provide a lifetime supply of carbon-free energy to a human at US consumption levels and make one soda can of gnarly radioactive waste. That waste is so small that it's feasible to safely dispose of it. The land, carbon, material, mining, etc. footprints of nuclear are tiny and that's what affect the environment. Nuclear is extremely clean.

[1] https://en.wikipedia.org/wiki/Onkalo_spent_nuclear_fuel_repo...