When Prince Charles meets Pope Francis at the Vatican on Tuesday it is likely that there will be plenty of discussion about issues dear to them. One of those is climate change – Pope Francis’s encyclical on the environment, Laudato Si’, was emphatic that climate change is real and he has accused sinful mankind of turning the planet into a “polluted wasteland full of debris, desolation and filth”, while the Prince in his foreward to a book on climate change he co-authored has called it the “wolf at the door” and urged that action must be “urgently scaled up, and scaled up now”.