Campaigners have won a High Court battle over plans for a third runway at Heathrow Airport.
Councils, residents and green groups had said the government's approval of the runway was flawed by "conspicuously unfair" public consultations.
Lord Justice Carnwath, sitting in London, upheld their argument that the government's policy support for a third runway will need to be looked at again.
Prime Minister Gordon Brown said the new runway was "compatible" with carbon reduction targets and would help secure Britain's economic future.
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