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Panellists: Martha Wainwright, Canadian Singer - Songwriter; Bill McKibben, American Environmentalist; Michael Stutchbury, Editor-in-Chief of The Australian Financial Review; Linda Burney, Indigenous MP; and Cory Bernardi, Liberal Senator.

Host Tony Jones is joined by Liberal Senator Cory Bernardi, Shadow Health Minister Catherine King; Former Lord Mayor of Sydney Lucy Turnbull; Spectator Australia's Rowan Dean; Theoretical Physicist Lawrence Krauss.

Joining guest host Hamish Macdonald: Liberal MP Sarah Henderson, Shadow Health Minister Catherine King, Australian Conservatives Leader Cory Bernardi, The Saturday Paper Editor-in-chief Erik Jensen and comedian Corey White.