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Nearly 30 countries, including the U.S., had refused to sign the non-binding contract in December. Brazil's administration has promised to defend "national sovereignty."

Nearly 200 countries have delegates in Bonn, Germany, this week, trying to figure out how to fight global warming. They're at a difficult point — what the nations have pledged so far isn't enough.

The way we produce food and manage land must change radically if humans hope to avoid catastrophic global temperature rise, according to a new report by the United Nations panel on climate change.

The United Nations is calling for a demilitarized zone around a nuclear power plant in southern Ukraine.

"You have stolen my dreams, and my childhood, with your empty words. And yet I'm one of the lucky ones," activist Greta Thunberg, 16, tells world leaders.

The two-week event had been due to take place in Chile, but because of social unrest in that country, the Spanish capital Madrid offered to host it instead.

World leaders will gather at the U.N. to address poverty, hunger and inequality. NPR's A Martinez talks to Amanda Gorman, who reads part of a poem she wrote for an appearance at the General Assembly.

The U.N. climate summit's landmark decision sets aggressive targets for cutting greenhouse emissions. It also promises more aid for developing countries, but many of those countries wanted more.

"Sadly, based on the tremendous anger and open hostility displayed in your most recent statement, I feel it is inappropriate, at this time, to have this long planned meeting," Trump wrote.

The conference, known as COP28, opened in Dubai on Thursday. Questions focus on whether real action will be taken to slow global warming, and on the host country as a major oil producer.