Starting about 15 years ago, Britain saw a wave of heightened concern about climate change. It emerged in the spring of 2004, peaked in late 2006 and by the early 2010s had largely dissipated. But concern about climate change has made a dramatic comeback in 2019. This year has seen a ‘climate spring’ – the school strikes for climate, the net zero report by the Committee on Climate Change and above all the demonstrations by Extinction Rebellion have all pushed the issue way back the agenda. A climate emergency has been declared by multiple bodies and authorities, including Parliament. How far are things different this time round?