Evidence of global warming can be found in a global increase in the frequency and severity of droughts, right? That’s what scientists thought, but a new paper in Nature finds no evidence that warmer temperatures in recent decades have correlated with (let alone caused) an increase in droughts. Contrary to what the IPCC had concluded in its 2007 assessment, the new analysis finds “there has been little change in drought over the past 60 years.” Roger Pielke Jr. has more.