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If a plant can grow in an area, any area, it will do so.
If an animal can find a habitat in any area on earth, it will do so.
At first, this only enabled a slight increase in population. Animal and human waste could greatly increase plant production.
Soon only plants that produced the most grain, fruit or tuber per plant, or per area of ground, was selected for replanting. Animals were domesticated and the plow was invented. Then chemical fertilizers were invented and the population floodgates were opened.
A species usually enters overshoot when it taps a particularly rich but exhaustible stock of a resource. When we talk about carrying capacity we need to define exactly who or what we are carrying. Well, let’s just talk about terrestrial vertebrate biomass.