There are natural concentrations of radionuclides on the planet as well, there was even one place where a spontaneous fission reaction took place (Oklo, Gabon) millions of years ago. If you dig a sufficiently deep hole in a massive slab of granite (like Scandinavia), you can store all the waste of mankind there for approximately eternity.

German Greens absolutely love your argument, but compared to the pollution that we produce everyday and which kills people and animals every day, waste storage is a nothingburger.