Albert Allen Bartlett, American physicist and academic (b. 1923)
Albert Allen Bartlett (March 21, 1923 – September 7, 2013) was an emeritus professor of physics at the University of Colorado at Boulder, USA. As of July 2001 Professor Bartlett had lectured over 1,742 times since September, 1969 on Arithmetic, Population, and Energy. Bartlett regarded the word combination "sustainable growth" as an oxymoron, since even modest annual percentage population increases can represent exponential growth. Over time, huge changes will then occur. He therefore regarded human overpopulation as "The Greatest Challenge" facing humanity.