GEORGE Osborne and other Tory Cabinet ministers are blocking the green policies advocated by David Cameron before the election, a leading environmental charity has claimed.

The Chancellor is a "major source of the problem" and is taking an anti-business stance on renewable energy that could harm the party at the 2015 election, campaigners for the WWF alleged.

The comments came as the wildlife and environment charity presented a giant Christmas card to Number 10 calling for the Prime Minister to tackle climate change and support renewable energy.

The card, which was signed by more than 40,000 supporters and 25 charities and non-governmental organisations, features a photograph of Mr Cameron "hugging a husky" taken during a trip to the Arctic with WWF in 2006.

A trio of huskies accompanied the delivery of the card, pulling on their leads at the gates of Downing Street.

Dr Keith Allott, head of the WWF's climate change programme, has said he is disappointed Cameron's enthusiasm for tackling climate change has waned since the election, and pointed the finger at parts of the Tory party.

"There is certainly an element on the Tory backbench which has been very vocal. And there is an element in the Cabinet which has unfortunately been increasingly vocal, which seems to be convinced that action on climate change is bad for the economy," Dr Allott said.

"It is very clear that some of the problems do stem from George Osborne, who just clearly believes that this country should embrace a dash for gas as the heart of our energy future, despite the fact that in doing so that would clearly undermine our legally binding climate change targets."

Mr Osborne is "a major source of the problem" but "there may be other voices" in the Cabinet, Dr Allott said.

The WWF is calling on Mr Cameron to rediscover his enthusiasm for the environment that saw him play an instrumental role in pushing through the Climate Change Act in 2008.

The charity also challenges him to fulfil his 2010 pledge to lead the "greenest government ever".