Joining Q&A this week were: the Minister for Climate Change and Water, Penny Wong, Shadow Treasurer, Malcolm Turnbull, scientist and global warming activist, Tim Flannery, businesswoman, Catherine Harris and the Director of the IP and Free Trade Unit at the Institute of Public Affairs, Tim Wilson.

On Q&A this week the writers dominated. The show featured author and academic, Germaine Greer, former NSW premier and author of My Reading Life, Bob Carr, deputy opposition leader Julie Bishop, The Australian newspaper's foreign editor, Greg Sheridan and curator and critic, Marcus Westbury.