Because the only true resource is human labor.
What you consider ‘natural resources’ aren’t of any use until human labor somehow extracts it and creates a use for it. The involvement of human labor is the most important part of the process and it’s the reason that even poor people today live with luxuries the kings of old couldn’t even contemplate.
Another way to consider this is that human development may be bounded in space but infinite in time – there is no set end point for it so we can continue to grow indefinitely.
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