By Paul R. Ehrlich and Anne H. Ehrlich, Yale Environment 360 | Eco-Watch. The view that overpopulation is not our problem just doesn’t wash. Using the I = P x A x T equation, one can see that the total impact of the U.S. is gigantic, several hundred times that of Bangladesh. These classic articles date from 1992 and 2008, which makes them all the more relevant and urgent.