⁠Reduced CFC emissions: The Montreal Protocol phased out chlorofluorocarbons (CFCs) in 1987 to protect the ozone layer., Implemented recycling programs: Cities worldwide introduced recycling initiatives in the 1990s to minimize waste., ⁠Switched from coal to gas: Power plants shifted from coal to natural gas in the 2000s to reduce air pollution., ⁠Banned DDT: The US prohibited the pesticide DDT in 1972 due to its harmful environmental impacts., ⁠Introduced catalytic converters: Car manufacturers added catalytic converters in the 1970s to reduce vehicle emissions., Cleaned up the Great Lakes: Governments and organizations collaborated to remove pollutants from the Great Lakes starting in the 1970s., ⁠ ⁠Phased out leaded gasoline: Leaded gasoline was gradually eliminated worldwide between 1970 and 2000., ⁠Established national parks: Governments protected vast areas of land by designating national parks, starting with Yellowstone in 1872., ⁠Restricted industrial waste dumping: Regulations in the 1970s and 1980s prohibited dumping toxic waste in oceans., Promoted energy-efficient appliances: Governments launched initiatives in the 1990s to encourage the use of energy-efficient appliances.,

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