There is no known way to dispose of the remains of the Chernobyl nuclear meltdown, so the plan is to cover it with a metal dome that is expected to last 100 years. Engineers hope that, within that time, we will find some permanent solution.

That approach may work assuming technology continues to advance. But what if technological advance ceases because global heating is too much of a drain on society? Then the reactor will degrade, and leak more. In centuries, or millennia, that fallout will pollute a much bigger area.