A couple of years ago I watched a speculative show titled, “Life After People,” which was intended to show (though of course this was not stated) how much better off the planet would be without us. It began with a day after all humans had (inexplicably) vanished, then a week, a month, a year, etc. For the “20 years later” segment, the camera crew went to a town close to Chernobyl to document what a previously inhabited town would look like 20 years after all the people had left. In and amongst their observations about the disintegration of the roads, buildings, etc., were a few surprised murmurs about the thriving flora and fauna, and much-lower-than-expected radiation levels, which made it possible for the crew to film safely.
Remember all the statements at the time of the Chernobyl incident about how the area would be uninhabitable for 10,000 years? Apparently today, 25 years later, people could move back and live there without risk of radiation poisoning.