Ecologist: Calculations on the cost of building a third runway at Heathrow are outdated and do not make economic sense says a new report Expanding Heathrow airport will result in a loss to the economy of £5 billion and lock the UK into a high carbon future, says a report from an independent thinktank. The Government gave the green light for a third runway in January 2009, saying the economic benefit of the expansion to the economy would be £5.5 billion. However, a report by the New …