A panel of four youth climate activists appeared before a joint hearing on climate leadership Wednesday, urging members to take action on climate change.

One of the witnesses, Greta Thunberg, a 16-year-old Swedish climate activist, submitted the 2018 Intergovernmental Panel on Climate Change report on global warming in lieu of an opening statement. “I don’t want you to listen to me, I want you to listen to the scientists,” she said. “And I want you to unite behind the science. And then I want you to take real action.”