Ian McEwan, Bill Nighy, Scarlett Johansson and Kristin Davis among those signing letter to Guardian ahead of climate talks. Writers, photographers, musicians and actors have appealed to politicians and diplomats to set aside differences and reach agreement in the UN climate change talks which resume next week in Cancún, Mexico. “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.