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Well, just for the record, according to that logic even linear or sub-linear growth is impossible - it's not just exponential growth that has a problem. When resources are limited, and technology is constant, then any growth *at all* is impossible over the "long term". But the thing is, that's never been a useful model for how things work in the real world, and I doubt it ever will be. When technology improves exponentially, things that would have been viewed as impossible become commonplace. Try looking at a plot how much food is produced per unit of land versus time - that totally messed up Malthus. Future improvements in technology will probably improve human productivity beyond our wildest dreams today.