Quoted: ?This is always the million-dollar question, but unfortunately, there?s no definitive way to answer it,? says Steve Vavrus, a senior scientist in the Nelson Institute Center for Climatic Research at the University of Wisconsin-Madison. ?We?ve experienced extreme heat, drought, floods, wildfires and windstorms throughout history, so in a sense this is nothing unusual. We need time to assess whether this year?s set of extreme weather events falls outside of normal variations.?