The believers have Scarlett Johansson and Helena Christensen on their side; while the realists have Richard Lindzen and Freeman Dyson

'In Cancún you can make history,' celebrities tell the world's politicians | Environment | guardian.co.uk

"Important progress was made in Copenhagen last year but not nearly enough. In Cancún, you can make history," the celebrities write in a letter to the Guardian. The group includes the author Ian McEwan and actors Bill Nighy, Scarlett Johansson and Kristin Davis as well as others from Mexico, Benin, Panama and Denmark.

The letter went on: "For millions of people on the frontlines of climate change, the time since Copenhagen has been the year from sheer hell as floods, droughts, fires, storms and other extreme weather events have wiped out crops and destroyed the livelihoods of some of the poorest people in the world. We know that the destructive impacts of climate change will mean more misery and pain for the world's poor, and increasing instability and insecurity around the world unless action is taken. As you prepare for a new round of talks in Cancún next week, it is abundantly clear that you must do better. And fast."