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The problem with logistic growth is that it is exponential growth that gets modified by resource factors which push the curve back down. While in graph form that looks nice, what exactly are those resource factors? Wars? Famines? Disease? An across-the-board decision to stop having large families?
When people say that population growth is exponential, they are not saying that in the year 2500 there will be quadrillions of people on Earth - the Earth just can't support an infinite population. An exponential growth (in the colloquial sense, obviously a fixed exponent can't apply to a chaotic system) has to hit a wall at some point. The warnings about exponential growth are about what happens when we hit that wall, at which point the logistic curve kindly curves in the right direction - but why? At what cost?
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| Len 17, Wid 3 |
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