There is consensus among scientists that global warming is real and that it’s caused by human activity. Despite the overwhelming evidence and the urgency to act, there are still many who are skeptical of or flat-out deny climate change. Are these climate deniers simply impervious to scientific evidence? Or have they just not been exposed to the right kind of information? When it comes to ideologically driven views, is it possible to change people’s minds by appeal to facts? Or are humans hopelessly and incorrigibly irrational? Ken and Josh don’t deny talking to cognitive scientist Michael Ranney, head of the Reasoning Research Group at UC Berkeley.