Her parents didn't want her to do it. Her classmates refused to join her. Passersby expressed pity and bemusement at the sight of the pigtailed teenager who sat alone on the cobblestones in front of the Swedish Parliament with a hand-painted banner saying School Strike for Climate. Before she went on strike, fifteen-year-old Greta Thunberg refused to speak and eat. She had no friends and no purpose in life. But one day she decided to act. A year later,...