Part 2 (see below)
A Parable
Garrett Hardin wrote, among other things, An Ecolate View of the Human Predicament (see online).  He explains an essential law of nature--of God's Creation--the carrying capacity of the land.  
In it he includes a Parable From Nature--The Parable of St. Matthew Island--a brief example of carrying capacity.  St. Matthew Is. is off the coast of Alaska (yes, that's its real name! see p. 7).  During WWII reindeer were left there as an emergency source of food.  There were no predators to control the population and the deer were left,  forgotten.  They multiplied to 6000 and then one winter the population collapsed.  Overpopulation results in environmental degradation and then starvation. 
And remember the previous warnings--Malthus explained the exponential math of population growth.  And in the Bible, in Revelations, the 4 Horses of the Apocalypse reveal what humans already knew--famine, epidemics, war and early death are population control of nature.