text: Guest essay by Professor Philip Lloyd People have the nasty habit of giving their opponents names. Those who are convinced that humans are wrecking the world by burning fossil fuels call those who dont believe them denialists. It implies that they are close to the Holocaust deniers, and so are clearly beyond the pale. I have come to the conclusion that they are wrong. The true denialists are those who believe in global warming, and who will go to any lengths to deny the evidence against that position. For instance, the final draft of the Fifth Assessment Report of IPCCs Working Group 1 concerns itself with observations of the climate and how it might change in future. Within minutes of it being released, skeptics had noted that a key figure, which compared predicted temperatures to measurements, had been drastically altered after the second draft had been approved.