We use stuff, yes, but now we overuse stuff. There is a difference between using and overusing. If it is difficult to calculate how to find the sweet spot of consumption without destruction at huge scale. At a smaller scale, it is easier, everyone of us knows that if you are living in a forest, you should use the wood in an intelligent manner. And not cut big chunks of the forest for having the luxury to overheat and over-shelter. The economic system that solves it is the one that does not use Usury or in other modern words Interest. Lending with interest should be prohibited.