AdvertisementGreta Thunberg To U.S.: 'You Have A Moral Responsibility' On Climate ChangeSeptember 13, 2019Bill ChappellAilsa ChangfacebookEmailSwedish activist Greta Thunberg, 16, attends a protest outside the White House on Friday. She launched the Friday school strikes last year, and since then, her fame has steadily grown. She is known for speaking in clear and powerful terms about why people — particularly young people — must pay attention to Earth's climate. (NPR)