Climate alarmists are given to declaring that a recent year or few years were the "hottest ever." But to do so they must downplay or dismiss episodes like the Medieval Warm Period, Roman Warm Period or Holocene Climatic Optimum (to say nothing of conditions before the Pleistocene Ice Age) because they don't just show that climate fluctuates naturally. They show that even since the end of the last glaciation it has often been hotter than it is now, and without the catastrophic consequences they predict if it gets slightly warmer, including the fabled runaway "greenhouse effect". But in this Climate Discussion Nexus "Backgrounder" video Dr. John Robson shows that abundant evidence demonstrates that these past cycles were real, and that what's really odd about current conditions is how low temperatures are in the current cyclical peak.