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