Former climate activist Michael Shellenberger has condemned alarmists for “terrorising school children” with false claims that the world is about to end... Adolescents these days have a lot to worry about, anxiety and depression are rising among everyone really, certainly adolescents, and I thought it was not right to be terrorising school children and giving them false information.” Shellenberger - who has been invited to be an expert reviewer to the UN’s Intergovernmental Panel on Climate Change - maintains that climate change is occurring but says it is not a “catastrophic threat”.