I think nuclear waste will prove to be a valuable resource in the near future.

When accidental exposure to nuclear waste creates a horde of giant houseflies, we'll need to intentionally expose some spiders to create giant spiders to eat the giant flies. Then, if the giant spiders become a problem, we'll just expose some birds to control them. Then, we'll probably need to expose some cats to eat all the giant birds. And then some dogs to eat the giant cats....

Eventually, all the animals on earth will have eaten each other and, by the time intelligent life evolves again, the remaining nuclear waste will have decayed into harmless sludge.