Paul Ralph Ehrlich was nominated Honorary Guide on April 28, 2012 ( 66 aH ) for his effort to stop the earth overpopulation, and even to ask for reducing it drastically. Paul Ralph Ehrlich is an American biologist, ecologist and demographer, best knownfor his warnings about population growth and limited resources. He became well-known after publication in 1968 of his controversial book : The Population Bomb.