Democrats lack an organized plan to stop global warming. Climate scientists say the newcomer has the beginnings of a good one. Progressives have been practically leaping for joy since 28-year-old self-described democratic socialist Alexandria Ocasio-Cortez won her primary election for Congress last week, an outcome that CNN called “the most shocking upset of a rollicking political season.” But perhaps no group has been more excited than environmentalists. In a political environment where even her fellow Democrats often stay vague on climate change, Ocasio-Cortez has been specific and blunt in talking about the global warming crisis. She also has a plan to fight that crisis—one to transition the United States to a 100-percent renewable energy system by 2035.