I’ve said it before, but Man and all his terrible works will be a thin toxic plasticky, mildly radioactive seam in the geological record.
My theory:
I suspect most wildlife in general would recover very quickly, most domesticated animals would revert to feral within a few generations after die outs of the initial populations. Certain areas around chemical plants and waste tips may suffer long term genetic damage but that’s only small area’s of the planet. Worryingly the large sea mammals and fish may suffer the worst as PCB’s and heavy metals like mercury will persist for many years so we may succeed in killing them off after our Ton initiated demise.
In answer to Andrew H, nukes are designed to be hard to go off by accident (though worryingly a few got dropped by accident in the 50’s and two were very close to going pop properly). So even when the casing cracks open the radioactivity will be confined to a local area, no mushroom clouds, not even a fizzle.
Power stations should safe themselves without human intervention but even if a few do go bang and China syndrome it’ll only be a relatively small area that is poisoned lethally (compared global surface area).