We are raiding the Guardian Long Read archives to bring you some classic pieces from years past, with new introductions from the authors This week, from 2019: He is the most beloved figure in Britain, and a global superstar. His films long shied away from discussing humanity’s impact on the planet. Now they are sounding the alarm – but is it too late? By Patrick Barkham. Help support our independent journalism at theguardian.com/longreadpod