ng the conditions for the return of diseases that were on=e controlled through immunization—and that could affect us all, ac=ording to an analyst at the Union of Concerned Scientists. Even the milita=y is affected, as recruiters struggle to find enough soldiers who meet fit=ess requirements. The percentage of overweight and obes

tailpipes, and they operate at 8o percent efficiency (vs. about 2O percent for internal-combustion engines). Skeptics will cite a 2O12 report from the Union of Concerned Scientists as evidence that electric cars aren't as green as some people make them out to be. That study correctly notes that autos powered by coal-generated