Here is a quote from Martin Luther King that might come as a surprise.
Unlike plagues of the dark ages or contemporary diseases we do not understand, the modern plague of overpopulation is soluble by means we have discovered and with resources we possess.
What is lacking is not sufficient knowledge of the solution but universal consciousness of the gravity of the problem and education of the billions who are its victim. (-Martin Luther King, Jr.,1929-1968)
Unsourced References:
Overpopulation - Wikiquote; Population Paraphenalia - World Population Awareness
Martin Luther King electrified people with his 'I have a Dream' speech, but the essence of what he said about overpopulation is perhaps less well known.
World population is over 6.5 billion and still growing.
Source: U.S. and World Population Clocks - POPClocks