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Foreign policy journalist Laura Rozen gives NPR's Scott Simon her assessment of the state of negotiations over Iran's nuclear program.

Greenhouse gas emissions will have to drop 40 to 70 percent by 2050 — and then drop even more, to nearly zero by the end of this century — a new U.N. report says.

David Greene talks to David Beasley, head of the U.N. World Food Programme, about the famines in Yemen and Nigeria, and how his agency is dealing with threatened funding cuts.

NASA has already scoped out most of the comets and asteroids large enough to do global damage. But the United Nations thinks an international consortium of space programs need to get together in an effort to stop smaller — but potentially still dangerous — asteroids from hitting Earth.

One sign of the poverty they're investigating — the recent (and surprising) reemergence of hookworm in Lowndes County, Ala.

The Sustainable Development Goals refer to the needs a woman has when she has her period but don't use the "m" word.

Anthony Banbury is stepping down as the head of the U.N.'s Ebola mission. He says the Ebola can't become entrenched in West Africa. And he thinks the fight is heading in the right direction.

Dozens of world leaders are expected to take part in this year's U.N. General assembly starting Monday in New York. The pandemic is casting a long shadow over the annual gathering.

"There is such a thing as being too late," President Obama says in his address to the U.N. Climate Summit. The White House is touting tools to boost "global resilience" in the face of climate change.

March 21 is especially popular — it's got five "international days," from World Poetry Day to International Day of Forests.