Swedish teenage climate activist Greta Thunberg endorsed Joe Biden in a tweet Saturday aimed at driving turnout in the election.
Why it matters: The 17-year-old Thunberg is among the world's highest-profile advocates for aggressive steps to combat global warming.
Quick take: Thunberg's backing underscores how left activists are consolidating around Biden, despite some groups' misgivings about his platform.
- He's picked up endorsements from groups on the left flank of the green movement, such as Oil Change U.S. and the political arms of 350.org and Friends of the Earth.
- Biden's platform has grown more aggressive in recent months, but still doesn't contain elements that many environmental activists want — notably a call to ban fracking.