Carl Sagan is also one of the most influential environmentalists of our generation. Although he gets most of his attention for his space-science contributions, before his death he dedicated a lot of attention to the planet we live on.
He was also an outspoken critic of nuclear weapons and the arms race.
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"A pessimist thinks things can't get any worse. An optimist knows they can."
Last edited by FlamesAddiction; 10-20-2009 at 11:20 PM.
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