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The Prometheus Institute Factbook | The Environment Wealth and Pollution Where incomes rose by $6,000-$8,000 per year (2001$) and where there was an initial increase in certain types of air pollution, pollution began to decline (Grossman / Krueger - Economic Growth and the Environment) The Endangered Species Act Only 13 of the 1,800 species have been recovered since 1973 (the program's beginning). (Stroup, The Endangered Species Act: Making Innocent Species the Enemy)
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