I see a basic design that attempts to incentivise good environmental behaviour by ‘linking’ purchasing power to en masse good behaviour. But is it meaningful for everyone’s purchasing power to go up simultaneously? Would the rich not benefit more than the poor if the value of money goes up? How might the ‘international community’ establish such a currency in the face of PR from debt-merchants paid for with unlimited money? What political biases would come with the currency if implemented by the ‘international community’?

Certainly money is a key part of the problem in ways not touched on here but this proposal is best left as a thought experiment, being both vague, impractical and politically unlikely.