16 May 2013
John Ashton CBE, founding director, E3G
10 Jan 2013
Tony Juniper is a campaigner, writer, sustainability adviser and environmentalist.
31 May 2012
Clive Hamilton is Charles Sturt Professor of Public Ethics at the Centre for Applied Philosophy and Public Ethics in Canberra
23 Mar 2011
Laurence Smith, professor of earth and space science, the University of California
16 Mar 2011
Sir David Attenborough, broadcaster and naturalist
13 May 2010
Mike Berners-Lee, leading expert in greenhouse gas footprinting
12 May 2010
Clive Hamilton, professor of public ethics, Australian National University
23 Feb 2009
James Lovelock, the originator of Gaia Theory, talks to science editor Tim Radford.
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