If few people ate meat, farmland and habitats would quickly be overrun by too many animals. Too many cattle, for instance, hammer habitats, fields, water sources, and so on, and eventually that would lead to diseased, starving animals and a weakened gene pool. Same goes for hunting. Without hunting, the numbers of wild game would rise above what the habitat (which is shrinking as human encroachment expands) could sustain, and vehicle-animal conflicts would increase. Eventually, starving animals would be wandering around, weakened and diseased, and if not taken down by predators, eaten alive,
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