If you can account for the resources of each hard drive it kills

There's probably enough data out already on how long hard drives last while mining Chia to make a reasonable estimate. It kills hard drives fast enough that a large percentage of hard drives which were mining at genesis are now dead.

Indeed, we should also account for such material resources allocated or wasted by all proof-of-some-resource crypto.

Like the number of GPUS hoarded up by a non-ASIC PoW coin, or even the manufacturing of specialized miners.

There actually is an estimate of this floating in the chia Keybase channel. I remember it being very low, but there are many variables. Even at 100x the estimate it came down to less than 10 million USD in CO2 offsets.