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Is It Possible to Track Population Size?
In the late roman period, you had a decline in atmospheric lead pollution. This isn't because the romans invented green technology, it's because they were mining much less. I think almost always a society with declining population sizes is a declining society. If human beings are failing to replace themselves, i'm just saying that if you were looking at an animal, and the animal stops breeding in captivity, it's clearly because of some difference between captivity and its wild environment. As i think perhaps right now we have put ourselves in captivity.