In the popular press, you often hear about climate change skeptics who are scientists. But do these skeptics really know what they are talking about? Are they high-profile scientists with legitimate doubts or do they quacks? Today’s Proceedings of the National Academy of Scientists contains a new analysis by Aneregg and colleagues showing 97% of the climate researchers most actively publishing in the field support the IPCC conclusions. They also find that the relative climate expertise and scientific prominence of the researchers unconvinced of ACC are substantially below that of the convinced researchers!