When it comes to global warming, most people think there are two camps: "alarmist" or "denier" being their respective pejoratives. Either you acknowledge the existence of manmade climate change and consider it a dire global threat, or you deny it exists at all. But there's a third group: the "lukewarmers." In Lukewarming: The New Climate Science that Changes Everything, Cato scholars Pat Michaels and Chip Knappenberger explain the real science...