Preservation of foods has been carried out for thousands of years. Many of these processes such as bottling, drying, smoking, salting, etc would see a huge resurgence.
Almost none of these processes are all that high tech and some (such as sun drying) don't even require fire.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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