Garrett Hardin — American Environmentalist born on April 21, 1915, died on September 14, 2003
Garrett James Hardin was an American ecologist who warned of the dangers of overpopulation. His exposition of the tragedy of the commons, in a famous 1968 paper in Science, called attention to "the damage that innocent actions by individuals can inflict on the environment". He is also known for Hardin's First Law of Human Ecology: "You cannot do only one thing", which "modestly implies that there is at least one unwanted consequence"... (wikipedia)