We did know this, and for a while even China was trying to slow the birth rates in their country.. and then the 80's hit and the Me Generation started cranking out kiddies.. and suddenly being aware and responsible for your impact on the planet became passe.
Fun fact: It was never passe. There's a saying" Mankind forgives, nature doesn't. In the real world cause and affect never go away even when you choose to bury your heads in the sand.
It reminds me of costal communities back in the 1990's that were continually whining about beach erosion, as if suddenly the cycle had after millions of years accelerated in less a decade.. what made more sense and is actually the case was that the sea level was on the rise.
But hey, calling something beach erosion is less scary.
Let's talk fish then. One thing people always believed is if they stick a net in the ocean they'll pull out the same quantities of fish as their ancestors did generations before them barring seasonal variations.
But back in their ancestors days let's say there were just 100 fishers in the area, come forward to this generation and there are 1000 and they are using nets that don't catch some fish they're using nets that catch most fish. That's not a sustainable cycle.
In nature, normally when a species population reaches a critical point that population would crash after having exceeded it's food supply.
Enter Man the toolmaker. No longer do we have massive die offs from plagues and food shortages except in the poorest of countries or where warfare has disrupted supplies.
Something will give.
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