Eighty years after U.S. President Franklin D. Roosevelt’s New Deal created a raft of public-works programs to address the Great Depression, some present-day members of his political party say measures no less grand in scope are needed to address the existential threat of global warming. A band of self-described progressives in the Democratic Party, energized by the party’s successes in the 2018 congressional elections and aching to unseat Republican President Donald Trump in 2020, have put forth