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“4.0 is the best yet! If there are planetary heroes, you are top of my list.” –David Orr, Oberlin College on Plan B 4.0: Mobilizing to Save Civilization.
Lester Brown in Robert Kunzig’s article, “Population 7 Billion,” National GeographicJanuary 03, 2011
Lester Brown quoted in National Geographic's Special Series "Population 7 Billion" by Robert Kunzig. Posted January 3, 2011.
