“The emissions were a significant factor” in the decision to cancel the runway-building plans, Teresa Villiers, Britain’s minister of state for transport, said in an interview. “The 220,000 or so flights that might well come with a third runway would make it difficult to meet the targets we’d set for ourselves.” She said that local environmental concerns like noise and pollution around Heathrow also weighed into the decision.The air travel industry is, expectedly, crying betrayal, while environmental activists are pleased, though uncomfortable with the decision coming from the despised Tories.
From what I understand it, the opposition to airport expansion was actually driven by the Tories, rather than having been grudgingly ceded to the Lib Dems. Could there be a Nixon-in-China thing happening here? New Labour, keen to not be mistaken for Old Labour, were anxious to avoid anything that seemed left-wing, such as opposing air travel. (It may not just have been Blairite triangulation; perhaps there was also a calculation that an ongoing age of cheap flights to credit-bought second homes in the Essex end of Spain, stag weekends in Estonia and Ecstasy-fuelled raves in the Balearics would keep the public's cool-Britannia love affair with New Labour burning, at least until the oil ran out.) The Tories, however, have less to prove as far as being pro-business goes, and can afford to pass by some of the more short-termist decisions.
A high-speed railway network is planned to replace domestic flights across Britain; it should be ready in about 20 years.