[Update: Live coverage of the climate protests in New York City.]

Her protests on Fridays demanding action on climate change have inspired children to demonstrate in at least 100 countries. Her admonitions to grown-ups to “tell it like it is” have won her an invitation to speak at the United Nations — and detractors who have called her naïve.

Now, after sailing across the Atlantic on an emissions-free yacht, Greta Thunberg, the 16-year-old Swedish climate activist, has disembarked in Lower Manhattan ahead of her speech next month at the United Nations Climate Action Summit.

After a 15-day sail that was obsessively tracked by European news media, cheered by fellow climate activists, mocked by critics and rocked by rough waves off Nova Scotia, Greta and the boat’s crew went through customs on Wednesday morning while anchored off Coney Island, Brooklyn.