 States with dirtier generation that rely heavily on coal still lag, such as Colorado, where the average BEV only achieves the same emissions as a gasoline-powered car.The author of the 2014 analysis noted that the benefits are not distributed evenly across the U.S. because electric car adoption is concentrated in the states with cleaner power.In November 2015 the Union of Concerned Scientists published a new report comparing two battery electric vehicles (BEVs) with similar gasoline vehicles by examining their global warming emissions over their full life-cycle, cradle-to-grave analysis.