A lifelong Londoner, Sadiq Khan developed adult-onset asthma as a result of London’s dirty air. As he became Mayor of London, and worked with other Londoners to bring practical, progressive change to bear on issues of health and environmentalism around the city, London became world-leading in positive climate action. This book celebrates what’s happened, looks at practical action in politics, tells the story of Sadiq’s london story - and asks that readers hold his actions to account.