New York Times: The Times has published several letters responding to Overpopulation Is Not the Problem, an Op-Ed article by the ecologist Erle C. Ellis (who expanded on that piece here). The first is from a trio of seasoned sustainability scholars, all of whom have been longtime contacts of mine: Joel E. Cohen, Daniel P. Schrag and William C. Clark, who are, respectively, a professor of populations at Rockefeller and Columbia Universities, director of the Harvard Center for the Environment and director of the...