A quarter century ago James Hansen’s dramatic testimony to the U.S. Senate, in which he stated that global warming had already begun, helped turn a little-known issue into a widely recognized social problem (McCright & Dunlap, 2000). However, not only has little progress been made in dealing with global warming in the ensuing years, but it has become even more problematic as greenhouse gas emissions have continued to rise—generating additional warming and risking increasingly negative impacts on both social and natural systems (National Research Council, 2010).