Great Book: "The Population Bomb" by Paul Ehrlich - Basically, too many people will cause ecological disaster and mass starvation... written in 1968...

https://en.wikipedia.org/wiki/The_Population_Bomb 

He argued that the growing population placed escalating strains on all aspects of the natural world. "What needs to be done?" he wrote, "We must rapidly bring the world population under control, reducing the growth rate to zero or making it negative. Conscious regulation of human numbers must be achieved. Simultaneously we must, at least temporarily, greatly increase our food production."

https://www.amazon.com/Population-Bomb-Paul-R-Ehrlich/dp/1568495870


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