Greta Thunberg on NPR

Thunberg also believes the U.S. has an "incredibly important" role to play in fighting climate change. "You are such a big country," she says. "In Sweden, when we demand politicians to do something, they say, 'It doesn't matter what we do — because just look at the U.S.' "I think you have an enormous responsibility" to lead climate efforts, she adds. "You have a moral responsibility to do that."