Kenneth Boulding? Paul Ehrlich? David Attenborough? Mancur Olson? Wayne H. Davis? Jay W. Forrester? John S. Steinhart? Anonymous? Dear Quote Investigator: Population size, energy use, and gross domestic product (GDP) have grown exponentially for limited time periods within some nations; however, these trends are complex. Economies sometimes shrink; per-capita energy use sometimes declines; human population …