UN Sec-Gen António Guterres arrives for a press briefing to mark the opening of the 74th session of the United Nations General Assembly at the UN Sept. 18 in New York. TIMOTHY A. CLARY / AFP / Getty Images
By António Guterres
On the eve of the September UN Climate Action Summit, young women and men around the world mobilized by the millions and told global leaders: "You are failing us."
