Cities with clean air gain an economic advantage, because where people want to live and work, businesses want to invest.

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• Carrie Fisher

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• George Carlin

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• Stephen Hawking

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  Thursday, Jan 08, 1942
  

• Alfred Lord Tennyson

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• Johann Wolfgang Von Goethe

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• John F. Kennedy

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• Voltaire

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• Theodore Roosevelt

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• Henry David Thoreau

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• Carl Sagan

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