Conversation: Dire warnings of imminent human-induced climate disaster are constantly in the news but predictions of the end of the world have been made throughout history and have never yet come true. Even in the brief period of recorded history, natural climate change has always been with us whether it is the volcanically induced crop failures that helped precipitate the French Revolution or the Medieval Warm Period that allowed Vikings to colonise Greenland. So how can we trust that the computer models scientists...