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Why? Pesticides kill non-pests, irrigation dries up entire rivers, destroying ecosystems, waterways get poisoned, nutrients run off land, deforestation causes erosion, mono-crop farms starve bees, etc., etc. Humans, through our large-scale agriculture, have an unprecedented negative effect on our environment. Subsistence farming has had these effects to a much smaller extent (due in part to it only being viable with smaller populations).

But, people need to eat, and so here we are. Alternatives to traditional agriculture would be great, but must make economic sense to actually take hold.

Besides, subsistence farming is agriculture.

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