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4) re-localization of food and the collapse of industrial monocropping
5) a massive population loss - I'm not optimistic about this happening obviously, it's going to be awful, but if it happens it will be because it is inevitable, and after the inevitable, a possible new paradigm will emerge that recognizes the presence of ecological boundaries and dismisses hubris about humans being above nature as, quite literally, insane
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What you propose in #4, directly begets #5. I would think human death would be immoral to you? Anyway, I'm optimistic that healthy food will become an item like computers today - you pay a premium to get it, but it's still affordable at a wide range of budgets. I think we should also expect to see an explosion of these sorts of foods at all income levels - it's a huge unexploited market, even if we lack the technology or werewithal right now. And don't forget the role of farm subsidies in creating this whole mess.