Right now, 260 million children are not in school, and many more are in the classroom but not receiving a quality education. Let down by poorly trained teachers, outdated curriculums and lack of digital connectivity, they risk not reaching their full learning potential.  Next week, world leaders will debate solutions to this crisis at the historic Transforming Education Summit in New York during the United Nations General Assembly.   To mark the summit, Theirworld Chair Sarah Brown spoke with Jayathma Wickramanayake, United Nations Secretary-General's Envoy on Youth, and two Theirworld Global Youth Ambassadors, Mathilde Boulogne and Yuv Sungkur, who will be attending the event.   The Envoy spoke about why it is crucial for world leaders to listen to young campaigners and offered advice to young people trying to make their voices heard.   Mathilde and Yuv discussed why they are supporting the #LetMeLearn campaign, and what action they hope world leaders will take to avert an education catastrophe.