1968 Paul Ehrlich publishes The Population Bomb David Lam, How the world survived the population bomb, University of Michigan Population Studies Center, 2011

“ The world, especially the developing world, is rapidly running out of food…. In fact, the battle to feed humanity is already lost, in the sense that we will not be able to prevent large-scale famines in the next decade or so.” - Paul Ehrlich, The Population Bomb, 1968

Urbanization of the World’s Population “Urbanized societies, in which a majority of the people live crowded together in towns and cities, represent a new and fundamental step in man’s social evolution.” Kingsley Davis

Urbanization of the World’s Population “The large and dense agglomerations comprising the urban population involve a degree of human contact and of social complexity never before known.” Kingsley Davis

More and more people are living in urban areas DeStefano et al (2005)

Urbanization of the World’s Population What are the factors that determine population growth in cities? 1) Birth rate 2) Death rate 3) Rural-to-urban migration and/or Immigration

Copyright © Allyn & Bacon How Many Millions of People Live in the World’s Largest Megacities?

Megalopolis Illustrates the difference between strict city proper definitions and broader urban agglomerations.

Norman Borlaug, “Father of the Green Revolution” 1970 Nobel Peace Prize Winner Discovered ho to breed wheat that was disease resistant and that would grow in difficult environments.

Julian Simon

Los Angeles

Bombay

Chicago

Melbourne

Sao Paulo

Tokyo

New York

Millions of Discarded Tires in a Dump in Colorado, U.S.

Discarded Solid Waste Litters Beaches

Leaking Barrels of Toxic Waste at a Superfund Site in the U.S.

Effects of Acid Rain Acid deposition destroys structures and living organisms