Have you seen this lecture:

Jasper Kirkby ~ 
Head of the CLOUD Experiment - CERN, Geneva.

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http://www.youtube.com/watch?v=63AbaX1dE7I
Apr 20, 2011

This lecture is part of SFU's 2011 global warming seminar series "Global Warming: A Science Perspective".

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Kind of interesting, but no clear conclusion.

Camburn just posted a link to another video by Kirkby here:

http://www.skepticalscience.com/news.php?n=730&p=3#51245

Article with video is here:

http://physicsworld.com/cws/article/multimedia/45950

yea, that physicworld video is what started me on this.

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The three cheers quote of the day:

Lindzen Illusion #7: The Anti-Galileo
@78 Camburn
Having an open mind doesn't mean letting your brain fall out.