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Pennsylvania colony governor William Penn ordered colonist to conserve one tree for every five trees they cut down
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The Lacey Art prohibited thetransport of illegally obtained wildlife across state lines and madse hunting in Yellowstone National Park illegal.
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The Burton act was passed by the congress, it keeps hydroelectric power facilties away from Niagara Falls.
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Congress passed the first Clean Air Act, that regulated air pollution and emission
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General Motors president Edward Cloe told Americans there would be "pollution free" cars by 1980
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NASA warned Congress about the effects of the global warming.
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The Oil Pollution Act streamlined the EPA's ability to prevent and clean up serious oil spills.
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Kyoto Protocol implemanted as countries around the world pleged to cut down on the emission of gasses that cause global warming.
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Live Earth concerts took place worldwide by many famous artists to raise awareness for climate change.
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Great lakes compact signed by the states of all eight great lakes to prevent distribution and sale of water to nonregions.
