CNN ponders on its future in the toilet, so to speak
(archive.ph)
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That's why traditional mixed farmers rotated their fields, so that the cow and pig shit from pasturing would fertilize the crops for the next year or three.
Population explosion destroyed all that.
Well, not so much population explosion as much as the push for everyone to live in the city in a box. And the idea that farmers were poor idiots. And the rise of the use of chemical fertilizer. All happening at about the same time, pushed by the same people... such a coincidence, I am sure.
And the destruction of vast bird populations, many of whom controlled insects (such as the Eskimo Curlew).