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NPR's Sarah McCammon previews this year's UN climate summit with Kelly Sims Gallagher, an environment and resource policy expert and dean of the Fletcher School at Tufts University.

A new U.N. water report warns the world is headed toward a global water crisis if human-caused climate change and population growth aren't addressed.

NPR's Ari Shapiro talks with Tom Fletcher, the UN's top humanitarian and emergency relief official, about his first-hand look at what's been called "the world's worst humanitarian crisis" in Sudan.

We look at what happened during the first week of the United Nation's annual climate conference in Baku, Azerbaijan.

The U.N. relief agency for Palestinian refugees in the Gaza Strip said its employees were among 18 people killed in an Israeli airstrike on a school. Israel said the school was being used by Hamas.

Scientists and mayors from around the world gather in Nice to find solutions ahead of the U.N. Ocean Conference.

The U.N. Intergovernmental Panel on Climate Change released a report on how the world's oceans and ice are affected by climate change. Sea level rise is accelerating as is ocean warming.

Less than 24 hours after Ukraine and Russia formalized a deal to reopen Black Sea ports and resume agricultural exports, Russian missiles hit the port in Odesa.

The Security Council has struggled for months to pass a resolution related to COVID-19 because of tussling between the U.S. and China over a reference to the World Health Organization.

President Trump will be among the world leaders in New York City for the opening of the U.N. General Assembly. A study looks at whether Americans trust Trump to handle North Korea's nuclear threat.