The 60-foot yacht she chartered to get her from England to New York has returned to Europe, and Thunberg says she does not know how she will be returning to Sweden.Greta Thunberg, the 16-year-old Swedish climate activist, has been making waves the world over with powerful speeches and appearances in climate strikes. Since late August, she’s been on a tour of North America, attending rallies, meeting with world leaders, and speaking at the United Nations Climate Action Summit in New York City. She’s set to march in a climate strike in Edmonton on Friday, Oct. 18. Thunberg has said she...