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Where have all the clear skies gone?

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Author Topic: Where have all the clear skies gone?  (Read 1160 times)
Paul
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« on: July 22, 2008, 07:50:34 am »

Isaac Asimov wrote some years ago that he thought the Earth is capable of comfortably sustaining no more than a billion people indefinitely. We currently have 6.5 billion and this is the problem.
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