The professor who refused to sign last week’s high-profile UN climate report because it was too ‘alarmist’, has told The Mail on Sunday he has become the victim of a smear campaign. Richard Tol claims he is fighting a sustained attack on his reputation by a key figure from a leading institution that researches the impact of global warming. Prof Tol said: ‘This has all the characteristics of a smear campaign. It’s all about taking away my credibility as an expert.’ Prof Tol, from Sussex University, is a highly respected climate economist and one of two ‘co-ordinating lead authors’ of...