There are all kinds of perverse incentives there. Oil is a great way to sequester CO2, but pumping it out of the ground doesn't help our problems. Yet it would still be valid currency.
You could ban oil as a store, but people will use it as a power source for net positive emissions processes to sequester CO2 in another form.
It also makes money laundering laughably easy (plant trees). Then again, maybe we care less if we can turn that money towards good.
And there are also the general issues with using a physical currency. It's hard to transact across distances. You could do a bank-like system, but at that point it starts to look like carbon credits and calls into question the necessity of a parallel currency.
You could ban oil as a store, but people will use it as a power source for net positive emissions processes to sequester CO2 in another form.
It also makes money laundering laughably easy (plant trees). Then again, maybe we care less if we can turn that money towards good.
And there are also the general issues with using a physical currency. It's hard to transact across distances. You could do a bank-like system, but at that point it starts to look like carbon credits and calls into question the necessity of a parallel currency.