Chicago to turn off lights for one hour

Chicago plans to join more than 20 other cities and shut off exterior lights on public buildings for an hour in an effort to raise environmental awareness.

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<p><a href="http://www.physorg.com/news122400732.html">Chicago to turn off lights for one hour</a></p> <p>Chicago plans to join more than 20 other cities and shut off exterior lights on public buildings for an hour in an effort to raise environmental awareness. </p>