Alexandria Ocasio-Cortez’s stunning primary victory over powerful U.S. Rep. Joe Crowley in the working-class New York district stretching from the Bronx to Queens is likely to propel her avowedly left-wing platform into the Democratic mainstream as the 2018 midterm elections heat up. But her detailed proposals to deal with climate change could prove among the most influential at a time when the Democrats have failed to rally around any policy that could feasibly reduce greenhouse gas emissions dramatically enough to make a difference. Ocasio-Cortez outlined plans to transition the United States to a 100 percent renewable energy system by 2035....