I am glad that the hon. Lady has mentioned the target. The groundbreaking Climate Change Act 2008, which is unique to our country in having all-party support, set up the independent Committee on Climate Change. All Governments depend on evidence and the best science to show what we can do. The independent Committee on Climate Change says that the 2050 target is the right target: it is ambitious but feasible, whereas the 2030 target is not necessary and not deliverable. We risk undermining the very independence of the Committee on Climate Change and the evidence-based policy-making approach that we must take if we start to pluck numbers out of thin air for political gain.