23rd Feb 2009; 13:00

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James Lovelock, the groundbreaking originator of Gaia theory, visits the RSA to warn that we are about to reach a tipping point, beyond which our planet will not recover sufficiently to sustain human life comfortably.
How can we realign the delicate balance of forces that make the Earth conducive to human life?
Chair: Tim Radford, a freelance journalist and former science editor, The Guardian
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Watch James Lovelock on RSA Vision.