Swedish activist Greta Thunberg, 16, attends a protest outside the White House on Friday. She launched the Friday school strikes last year. Since then, her notoriety has steadily grown as she speaks in clear and powerful terms about why people — particularly young people — must pay attention to our climate. Greta Thunberg led a protest at the White House Friday. But she wasn't looking to go inside: "I don't want to meet with people who don't accept the science," she says. The young Swedish activist joined a large crowd of protesters outside the White House Friday morning, calling for...