The Malthusian Moment: Global Population Growth and the Birth of American EnvironmentalismAlthough Rachel Carson's Silent Spring (1962) is often cited as the founding text of the U. S. environmental movement, in The Malthusian Moment Thomas Robertson locates the origins of modern American environmentalism in twentieth century adaptations of Thomas Malthus's concerns about population growth. For many environmentalists, managing population growth became the key to unlocking the most intractable problems facing Americans after World War II