Gatwick will shortly have a new owner. BAA is selling the airport for much less than it originally hoped in order to reduce the company's debt. But the new owners have already indicated they intend to expand Gatwick as soon as possible, including a new second runway.

Global Infrastructure Partners, which has paid much less than BAA wanted, want to give Gatwick a major make-over, including a second runway. An injunction prevents them from doing this until 2019 at the earliest, but GIP has suggested it will get planning applications sorted so a new runway could be built as soon as possible.

All four leading candidates for the forthcoming London mayoral election have joined forces to fight Gordon Brown's push for a third runway at Heathrow Airport. Ken Livingstone, Boris Johnson, Brian Paddick and Sian Berry have all agreed to feature in a new anti-expansion advertising campaign launched today. The ad features in the Times, Guardian, Independent and Evening Standard newspapers.

Our executive director John on why Boris Johnson will have to work much harder on his climate change agenda if he is to have any hope of running the capital.

Boris Johnson claimed, at the launch of his campaign to run London, that he "will be the greenest mayor, far greener than Ken". His ambition is to be congratulated, but his claim invites scrutiny.

We all know that Boris is a keen cyclist - the sight of his unhelmeted blond locks blowing around the street corners of London is an iconic image. But a lesser-known passion is his professed "love affair with the car" which "will never conk out". As the motoring correspondent of GQ magazine, he tells us, "I have sometimes attained velocities which are incompatible with my new status as a tribune of the people". And in many ways he is right to highlight this apparent incompatibility - between his racy, energetic and spontaneous persona and a newly professed concern for slowing the progress of global warming. To win the mayoralty of a city like London, a candidate should be able to display a deep understanding and commitment to environmental issues, a serious appreciation of the threat that climate change poses to all of us and a coherent plan for implementing some solutions.