A British Economist who said, "Human population cannot continue to increase. Consequences will be war, famine, and pestilence.
Founded Sierra Club in 1892; fought unsuccessfully to prevent the damming of the Hetch Hetchy Valleu in Yosemite National Park.
A biologist who published "The Population Bomb" in 1968; discussed overpopulation and food production issues for future generations.
president of the United States from 1901 to 1909, well-known for his conservation efforts. He established the first National wildlife Refuge at Pelican ISland.
First chief of the United States Forest Service; advocated managing resources for multiple use using principles of sustainable yield.
Wrote a "Sand Country Almanac" published a year after his death in 1948; promoted a "Land Ethic" in which humans are ethically responsible for saving as the protecters of nature.
Published "Silent Spring" in 1962; documented the environmental damage done by DDT and other pesticides. This book heightened public awareness at the start of the modern environmental movement.
Published "The Tragedy of the Commons" in the journal "Science" in 1968; argued that rational people will exploit shared resources.
IN 1974, determined that CFC's destroy stratospheric ozone.
Biologist who co0coined, with Robert MacArthur, the theory of island biogeography, which identifies factors that regulates species richness on islands.
Won the 2004 Nobel Peace Prize for "Green Belt" movement-planting trees in Kenya that provided food and fuel, and improved soil erosion and desertification.