The UN FAO is full of crap if they think the world can sustain growing enough for 8 billion to live.
With the rise from sustainable in 1910 to the 6.9 billion of now, soil depletion has been at an average of 1" loss per 10-12 years and significant humus/micronutient loss. That is 2/3rds of what there was back when humans were at a sustainable population. It is at a rate of 100 times average regeneration rate. It is similar with the use of aquifer water----2/3rds gone and being used at 100 times recharge rate, with major aquifers known to be gone by 2040 or before. It is also known that irrigation yields 6 times the amount of dry farming.
If the world were at a sustainable population, there would be no resource use over natural recharge and regeneration rates. But there has been, and since 1910.
Look at the percentage of people who are living on green power, having only one or no children to reduce population to sustainable, growing their own food with complete nutrition or getting it locally, and look at the percentage that are composting to make up for the soil loss.
People are not all the same happy family, but are interconnected through the global biosphere being polluted as a function of overpopulation. The overpopulation is being driven by the lowest spectrum of IQ, and those of even over average IQ but still too low to see the consequences of their actions in the future. Still too low to not be influenced by religious or cultural effects, or common selfish greed.
So what is the percentage of the population not having more than one child? What is the percentage of population living on solar or wind power? How about self built/installed independent systems? What is the percentage of the population who are the inventors of complex devices, scientists? What is the percentage of producers, to the percentage of service and non-producing people?
The world is full of sick, out of balance societies, with too few actually living sustainably in all ways. Various population groups are not equal at all, or anywhere near alike, except, unfortunately, genetically. Over-compassion is a human weakness, as is over-tolerance (like allowing a literal invasion of over-breeding, generally low IQ, hordes which will collapse a once great nation). Crowd tolerance is a negative genetic trait induced by crowded living over time. Ten thousand years ago only the crowd intolerance gene was present. The population was well below maximum sustainable, and when people felt crowded, they would move out to form another village. Now, there has been a vast increase in the human overcrowding syndrome, characterized by increased hostility, increased depressive illnesses, increased anxiety disorders, to the point of medications for them being pollutants in waterways (along with hormones for birth control trying to stem the cancerous growth). The developed crowd tolerance (which used to be a mainly Asian trait) has led to extreme overshoot of long term sustainable population, and with it, the attendant pollution and depletion of resources on a global scale.
Sustainability, and sustainable living, along with advanced biology and ecology are very difficult to teach to those of below 100 IQ. Even those with a modicum of knowledge about ecology most often do not apply the principles to themselves or humanity in general. The dumbing down of America has been documented and shows itself in fewer now "believing in" global warming (a scientific demonstrable fact) than just a few years ago.
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