Dick Smith's Population Puzzle looks at the future of Australia's population. Tony Burke, Minister for Sustainable Population Scott Morrison, Shadow Immigration Minister Bob Brown, leader of the Greens John Elliott, former leader of the Liberal Party Tony Shepherd, Chairman, Transfield Services Dr Tim Flannery, scientist and author Dr Nikki Williams, Minerals Council of NSW Dr Suvendrini Perera, Curtin University Steve Perryman, Mt Gambier Mayor Dr Tanveer Ahmed, columnist

Panelists: Former NSW Premier and republican Bob Carr; former Howard government ministers Nick Minchin (monarchist) and Amanda Vanstone (republican); entertainment reporter Angela Bishop (monarchist); academic and Aboriginal advocate Marcia Langton (republican with caveats); and Craig Reucassel (republican) from The Chaser.

Panelists: Chris Bowen, Minister for Immigration and Citizenship; Scott Morrison, Shadow Immigration Minister; Sarah Hanson-Young, Greens Senator; David Marr, journalist and commentator; Najeeba Wazefadost, Afghan Refugee and Piers Akerman, Political commentator.

Panelists: Social researcher and writer, Rebecca Huntley; former Liberal Minister, Nick Minchin; founder of the Australian Youth Climate Coalition, Anna Rose; mining magnate, Clive Palmer; Chief Executive of the CSIRO, Dr Megan Clark.

Panelist: Bill Gates, Chairman & Founder of Microsoft and Philanthropist.

Panelists: Dewi Fortuna Anwar, Senior adviser to Indonesian Vice President Boediono; Tim Lindsey, Director, Center for Indonesian Law, Islam and Society; Yuli Ismartono, Deputy Editor in Chief of Tempo magazine; Rafendi Djamin, Human Rights Advocate; Yenny Wahid, Islamic activist & daughter of late former President ‘Gus Dur’ Wahid; and Meidyatama “Dimas” Suryodiningrat, Editor in Chief of The Jakarta Post.

Panelist: David Suzuki, Renowned Environmental Scientist and Campaigner.

Panelists: Christine Lagarde, Managing Director, International Monetary Fund.

Panelists: Professor Dennis Altman, Gay rights activist and author; Paul Capsis, Entertainer; Julie McCrossin, Broadcaster and journalist; Fred Nile, Conservative Morals Campaigner; Julia Doulman, Transgender Woman; and Katherine Hudson, Founder, Wear it Purple.

Panellists: Christian Porter, Minister for Social Services; Nova Peris, Labor Senator, Northern Territory; Michael Fuller, Assistant Commissioner, NSW Police; Cathy Humphreys, Professor of Social Work at University of Melbourne; and Moo Baulch, CEO of Domestic Violence NSW.