Now, Hansen, a strong critic of George Bush's disinterest in the climate change issue, has rejected efforts from Heathrow campaigners to sign him up to the anti-runway cause. According to the Observer, he said:
"The number of runways you need for your airports depends on their traffic. You don't want to be so restrictive that you end up burning more fuel because planes are having to circle and wait to land because of lack of runway space. Coal is 80% of the planet's problem. You have to keep your eye on the ball and not waste your efforts. The number one enemy is coal and we should never forget that."