http://feeds.tvo.org/~r/tvobigideas/~5/16ft39Y2O-0/BI_Lecture_20090530_834125_GreenSummitP1_0x0_40k.mp3 Thomas Homer-Dixon and Chris Turner on the environment http://feeds.tvo.org/~r/tvobigideas/~3/16ft39Y2O-0/BI_Lecture_20090530_834125_GreenSummitP1_0x0_40k.mp3 2009-05-30 http://www.tvo.org/podcasts/bi/images/BIAlbumArt.jpg