London: All the frontrunners in the race for the London Mayor joined forces on Thursday to oppose Heathrow expansion.
Mayor Ken Livingstone, Conservative Boris Johnson, Liberal Democrat Brian Paddick, and Green Sian Berry appear in an advert criticising the plans.
Ministers want to build a third runway, and almost double the number of flights at the airport to more than 700,000 a year.
The advert, paid for by Greenpeace, AirportWatch and enoughsenough.org, shows the four politicians under the headline "London United".
It states: "All four candidates for London Mayor oppose the third runway at Heathrow. They don't agree on much, but they agree on this."
It will appear today in Evening Standard, The Times, Guardian and The Independent.
Greenpeace executive director John Sauven said: "When these four agree you know something's going on. The candidates fighting it out for the support of Londoners are all telling Gordon Brown he's got it wrong on Heathrow. A third runway would be bad news for the climate and deeply disturbing for people living under the flightpath.
"If Brown focused on getting people off short-haul flights and on trains we could reduce the climate impact of Heathrow instead of vastly increasing it."
The campaign comes amid growing criticism of the government consultation on expansion. The Plain English Campaign branded the wording of the document "atrocious".
A recent report said the economic benefits of expansion had been vastly exaggerated.
Ministers are under pressure to extend the consultation beyond its February 27 deadline.
