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Stephen Sackur talks to Mark Lynas, a veteran green activist who once led a campaign to vandalise experimental genetically modified crops. But that was then - now he says that GM technology is entirely safe, and is a necessity if we are to feed the planet. He has made a similar U-turn on nuclear power too.

The zeal of the convert can be a factor not just in religion but also in scientific debate. He says that he has junked ideology in favour of hard science. But is it really as simple as that?