Let us draw a distinction in relation to the expansion of air travel. It is not being encouraged by the Government; it is a fact of life that we have to react to and take into account. The hon. Gentleman might be aware that we are pressing for the inclusion of aviation in the European carbon trading scheme, which will represent an important way of controlling emissions. Biofuels have a wide range of applications, and aviation is one of them, although we should not exaggerate their use in that way, because of the amount of land needed for biofuel production. However, it has enormous potential. The Government have set up a taskforce chaired by Sir Ben Gill to examine the role of biofuels and agriculture, which will give us important advice on how we take this issue forward.