Melbourne University is running the festival of ideas from 1 October to the 6th. The environmental related presentations are all on the 2nd October (annoyingly on my birthday!). There are a number to look at if anyone is interested, but I think I can only make this one, and I am also going to the one on October 3rd "What can be done to curb the world’s expanding waist-line?".
See here for a link to State of the Environment http://ideas.unimelb.edu.au/events/evening-keynote-state-of-the-environment