Greta Thunberg has a message for world leaders at the United Nations this week: "We'll be watching you." Speaking at the Climate Action Summit in New York, Thunberg added, "This is all wrong. I shouldn't be up here. I should be back in school, on the other side of the ocean."
But instead, Thunberg, 16, is trying to convince politicians to take climate change seriously, and to do something to stop a global warming trend that will affect the world's children more than it affects anyone who's currently in power.