Teen climate activist Greta Thunberg met Nobel Peace Prize winner Malala Yousafzai at Britain's University of Oxford on Tuesday and posed for a picture together. Malala, is a student at the University of Oxford. The 22-year-old posted a photo on Instagram of herself and Thunberg sitting on a bench with their arms around each other, with the caption "Thank you, Greta Thunberg " and a heart emoji.