I am glad that the right hon. Gentleman asked that question because, as he knows, it is this party and this Government who are leading the world in setting a net zero target by 2050. There are people who do not think it can be done. There are all sorts of sceptics, pessimists and Britosceptics who think that this country cannot pull it off, but actually we can. We have cut carbon emissions in this country massively since 2010, and we will continue to do so. [Interruption.] The right hon. Gentleman says that it was his achievement. I remind him that, even though the population of London expanded by 200,000 during my tenure as Mayor of London, we cut carbon dioxide emissions by 14% with new technology, and that is the approach we will adopt.