- POV Docs at Princeton Environmental Film Festival The Princeton Environmental Film Festival runs from Jan. 26 to Feb. 12, 2012, at Princeton Public Library. The Oscar®-nominated 'If a Tree Falls' screens on Feb. 10 and will be followed by a Q&A with co-director Sam Cullman. 'The City Dark' (POV, 2012) screens on Feb. 11 with filmmaker Ian Cheney in attendance.