Simon Stiell, Executive Secretary, United Nations Framework Convention on Climate Change (UNFCCC), speaks during a Chatham House event in London, Wednesday, April 10, 2024. Humanity has only two years left "to save the world" by making dramatic changes in the way it spews heat-trapping emissions and it has even less time to act to get the finances behind such a massive shift, the head of the United Nations climate agency said. (AP Photo/Frank Augstein)