The main reason why we destroy nature is so that we can externalize the costs of what we're doing. We pollute nature, and we expect that other people will later pay the bill for it. We use scarce resources and do not think that later generations will have to pay an exorbitant price for the remaining scarce resources. What would happen if the demand of future generations were already present on the world market? Well, of course the price of scarce resources would go up because the price is a function of demand and supply; the supply would remain the same, but the demand would increase.
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