Do humans contribute to global warming? There’s been a robust debate over whether Mitt Romney has flip-flopped on this question. In this item, we’ll try to determine whether he has. We’ll start by noting that the Flip-O-Meter rates politicians' consistency on particular topics from No Flip to Full Flop. The meter is not intended to pass judgment on their decisions to change their minds. It’s simply gauging whether they did. Romney’s campaign website is silent on climate change. But in Romney’s 2010 book No Apology: The Case for ...