The climate crisis caused by human activity has opened the "gates of hell," UN Secretary General António Guterres said this Wednesday, opening a summit on climate change on the sidelines of the meeting of rulers at the organization's General Assembly. Before leaders from just over 30 countries invited to the meeting in recognition of their efforts to combat climate change, Guterres warned that if there are no changes, humanity is heading towards a "dangerous and unstable world." Droughts, floods, stifling temperatures, historic fires, "humanity has opened the gates of hell," as demonstrated by "the horrible effects of the horrible heat," Guterres said at the meeting at UN headquarters in New York. China and the United States, the two most polluting countries on the planet, were not invited to the event, called the Climate Ambition Summit. "Many of the poorest nations have every right to be angry," because they are "suffering the most from the consequences of a climate crisis that they did not cause," because they did not receive the promised financing and because their borrowing costs "are through the roof," Guterres said, the AFP news agency reported. Developed countries must deliver on their commitment to provide $100 billion to help countries in the Global South, replenish the Green Climate Fund and double adaptation finance, and the entire world must be covered by an early warning system. by 2027, as decided last year, he urged. "One summit will not change the world, but today can be a powerful moment to build momentum," the UN secretary-general said.