Guest guest Posted May 17, 2007 Report Share Posted May 17, 2007 This is probably the best single-source document I’ve seen on the topic. JJP http://environment.newscientist.com/channel/earth/dn11462?DCMP=NLC-nletter & nsref=dn11462 Version: 7.5.467 / Virus Database: 269.7.1/807 - Release 5/16/2007 6:05 PM Quote Link to comment Share on other sites More sharing options...
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