If you dissent from climate change orthodoxy you're liable to be confronted with a demand to see your academic papers, something that never happens to alarmists like Al Gore. So Dr. John Robson, a professional historian, explains why knowledge of the Earth's past is exactly what every interested citizen, PhD or not, should have to form a sound opinion on climate, which activists must want us all to have, since they want us all politically engaged on the issue no matter what degree we hold.