United Nations (UN) Secretary-General Antonio Guterres addresses the UN Climate Change Conference in Katowice, Poland, Dec. 3, 2018. Delegates from nearly 200 countries began talks on Sunday on urgent actions to curb climate change three years after the landmark Paris Climate Change Agreement set a goal of keeping global warming below 2 degrees Celsius. The two-week UN Climate Change Conference, known as COP24, is held in the southern Polish city of Katowice. (Xinhua/Jaap Arriens)