David Cameron is facing a growing challenge to his authority from senior members of his own party who say they have doubts about the Conservatives' stance on global warming.
Leading figures including Peter Lilley, the former cabinet minister, Andrew Tyrie and Ann Widdecombe are openly questioning the political consensus on climate change.
And today David Davis, the former shadow Home Secretary, warns in The Independent that the policy of tough targets to cut carbon emissions, supported by Mr Cameron, is "destined to collapse". He criticises "the fixation of the green movement with setting ever tougher targets, in the face of failure to meet earlier promises". He adds: "The ferocious determination to impose hair-shirt policies on the public – taxes on holiday flights, or covering our beautiful countryside with wind turbines that look like props from War of the Worlds – is bound to cause a reaction in any democratic country."