Controversial plans for a third runway at Heathrow Airport have been thrown into doubt after a court ruling.
The government's decision to allow the expansion was unlawful because it did not take climate commitments into account, the Court of Appeal said.
Heathrow said it would challenge the decision, but the government said it would not appeal.
The judges said that in future, a third runway could go ahead, as long as it fits with the UK's climate policy.
The case was brought by environmental groups, councils and the Mayor of London.
