Greta Thunberg is TIME magazine's Person of the Year. She said: "Wow, this is unbelievable!" The 16-year-old beat the Hong Kong democracy protestors. She became famous after her climate strike outside Sweden's parliament. Schoolchildren worldwide followed her example. She then spoke to the United Nations.

Greta is the youngest winner of the award. TIME said she changed people's minds. She got people to join a "worldwide movement calling for urgent change". It added that Greta shamed people who would not act. Donald Trump Jr said Greta's award was a "gimmick". Hillary Clinton said: "I am grateful for all she's done."