Positive tipping points could save the climate – this man shows us how

Professor Tim Lenton is having an afternoon in the chocka-block. In subsequent interviews, journalists want to ask Lenton, who is the director of the Global Systems Institute at the University of Exeter, one thing. They don't interview him for the same reason I do, he tells me. They are eager to hear about the news that will be published the next day. "Bad news paper," Lenton says, holding it up so I can see the title: Quantifying the Human Cost of Global Warming . Oh. Publishing like this is "something you have to do if you want to avoid the tyranny of economists telling you that [climate change] isn't a big deal after all," he says.  (Sarah LaBrecque)

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