>We're talking about substances that will remain toxic for thousands of years
Most substances are toxic forever. If you bury mercury or lead in a hole a dig it up in a few million years it will be just as toxic. Radioactive substances are an anomaly in that they become less toxic over time.
Most substances are toxic forever. If you bury mercury or lead in a hole a dig it up in a few million years it will be just as toxic. Radioactive substances are an anomaly in that they become less toxic over time.