Climate Change Bill [HL]

My Lords, that is a good question. As I have said, it should be quite straightforward to write rules for this area; no rule is perfect and you have to choose the best. Given that airports in particular are in specific geographical locations and, on the whole, are not movable—unlike the planes that go in and out of them—I should have thought that it would be no more difficult than for any other area. I do not disagree that there could be issues with that, but the point is that it would be useful from a policy point of view, and to the national authorities and the UK as a whole, to be able to see that level of split with regard to emissions. That would be useful to the national authorities, which will have their own climate change programmes. On the whole we welcome this. There are questions about how disagreement by one of the national authorities will be resolved. To me, this is a fascinating area. There will be other policy areas where there has to be some sort of federal agreement by unanimity. I should be interested to hear from the Minister of other areas of policy at the moment that require agreement by all national authorities, what operates there, how that is dealt with and how that might be used in relation to the Bill.