In an exclusive interview for the Politics Show, the Conservative Party leader, David Cameron said he would be prepared to tax air travel if it became necessary to combat climate change.
Mr Cameron said: "Some green taxes do hit the poorest in our society, so we have to think about that very carefully before we make taxation decisions.
"If it means putting a tax on air travel, then yes, that's something we'd be prepared to do."
He also gave his unequivocal backing to Liberal Democrat-controlled Richmond Council's plans to charge the drivers of the most polluting vehicles higher parking fees.
Asked today whether he would back specific measures like that, Mr Cameron said: "Yes - absolutely. Westminster, a Conservative controlled council, does free parking for battery controlled cars..."
He criticised the Government for failing to hit its own emissions targets.
Speaking ahead of the publication of Monday's Treasury report on the economics of climate change, the Conservative leader said "We have to wait and see exactly what the report says.
"But I think if you look at all the science that has been produced and the consensus amongst scientists, look at for instance the Al Gore film, I think it is clear we're reaching a tipping point.
"We have to act."
Mr Cameron even said he is willing to put a wind turbine on the roof of No.10 Downing Street if he becomes Prime Minister.
"I think it would be a great idea", he said.
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The Politics Show Sunday 29 October 2006 at 12:00 GMT on BBC One.
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