The assumption seems to be that future humans will be exactly as we are today, with our present concerns and present technology. How about, say, two hundred years from now? If we and our technology prosper, humanity by then will be unimaginably capable compared to now, with far more interesting things to worry about than some easily detected and treated stray radioactivity somewhere in the landscape. If we crash back to the stone age, odd doses of radioactivity will be the least of our problems. Extrapolate to two thousand years, ten thousand years. The problem doesn’t get worse over time, it vanishes over time.
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