Guardian: BAA is pushing ahead with a planning application for a third runway at Heathrow despite a warning from the government-backed Carbon Trust that airport expansion might have to be curbed to meet emission reduction targets. Britain’s largest airport owner has told the transport secretary, Lord Adonis, that it expects to launch a consultation on its plans after next spring. That could coincide with a general election, when the government’s backing for a third runway is expected to cost it …