Nuclear war has never been so dangerous a possibility.At least in the cold war both sides were primarily interested in the other side not blowing them to bits. But now we have people who are quite prepared to destroy themselves in the cause of obliterating others they see as evil, and surely sooner or later they will get their hands on nuclear weapons. How can we stop people being radicalised? Certainly not by offering them western consumerism as an alternative. But what could be more inspiring than saving the earth? Why aren’t we stretching every muscle and exercising every nerve to do it?