> while completely ignoring the immediate threat of radiation, which cannot be reversed for hundreds of thousands of years. Waiting hundreds of thousands of ye

> while completely ignoring the immediate threat of radiation, which cannot be reversed for hundreds of thousands of years. Waiting hundreds of thousands of years is the simplest way to reverse the "threat of radiation". Each radioactive isotope has a half-life; if you wait ten half-lives, the "threat of radiation" is reduced by a thousand times, and the isotopes with very long half-lives aren't that radioactive to start with (roughly simplifying, the shorter the half-life, the more intense the radiation).