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Carrying capacity is a system parameter that can only be determined empirically, as far as I know. It is a function of many things itself (e.g. food supply, disease prevalence, predation, and--in the case of humans--new technologies for energy extraction), and it is definitely not static. I'm sure we'll asymptotically approach some population, but I don't think that this population is necessarily our carrying capacity, at least it won't be if we can find a cheap, reliable, clean source of energy.