Concerning the Carrying Capacity of the Earth mentioned in my previous comment, God has given us a parable--the Parable of St. Matthew Island.  This is a parable found in nature.  In 1973 (thereabouts) the American ecologist, Garrett Hardin, was warning that we were reaching the tipping point of long-term sustainability in human population.  In a piece titled--An Ecolate View of the Human Predicament--he described an example found in nature of the consequences of violating the carrying capacity of the land-(This can be found online--see p. 7).  
note:  I call it a parable but that was clearly Hardin's intent--a brief example illustrating an underlying principle--and it concerns care for our common home, the earth. 
(St. Matthew Island is off the coast of Alaska).