ROME, ITALY – APRIL 19: Teenage climate Swedish activist Greta Thunberg attends Fridays for Future Climate Change rally in Piazza Del Popolo on April 19, 2019 in Rome, Italy. Greta Thunberg, the teenage activist at the head of a worldwide youth movement against climate change, addressed demonstrators in Piazza del Popolo, the central square where Italian activists have been gathering for weekly Fridays for Future rallies. (Photo by Franco Origlia/Getty Images)