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."

The United Nations Secretary General says that he is counting on public pressure to compel governments to take much stronger action against what he calls the climate change “emergency.”