A carbon price built into the economy, perhaps that means, eventually, resource rationing for every human being. Most of what we do causes pollution or just using something up, even if just fresh water. This is the look in the mirror moment.
We kinda use money but it's so abstract now that it has no connection to the natural environment. And yes what's sand until someone invents a process to coverts it to something useful. But many processes deplete.
Some regenerate, like soil regeneration. So maybe the concept of money creation should be environmental creation insofar as the environment in the end supports humans. If we don't need pandas or house cats then they're not part of the equation except as liabilities. Some environmentalists say we should eat the cats and dogs.
But regenerative farming would be actual wealth creation, as would any environmental intervention which supports our ecosystem for eventual human life.
I imagine this how eventually it'll have to go.
And having children would have to be costed in as well. Are your children going to be a net contribution to our economy of ecology, or a net drain? It may be that you have to borrow theoretical credits to have children and then train them to be, as an example, regenerate farmers, so they can repay your debt.
So you'd have to show you could train them well in that and that their skills are needed where you live. Dense cities might become a kind of weird luxury as they are mostly consumption machines.
Sounds crazy but the notion of externalities is ultimately about how our money symbols don't represent the environment but a weird story about who is permitted to make promises.