To be anti-car at the beginning of the twenty-first century is generally seen as irrational, unrealistic – yet what could be more irrational than promoting the unnecessary use of motor vehicles when ample evidence exists that already their emissions have done immense damage? A risk is something one can disregard; with luck all will be well. A certain future disaster, as a result of an avoidable present course of action, can only be disregarded by those whose logical faculties are paralysed.