The world’s nations are gathering in Spain for a high-level conference to tackle the growing gap between rich and poor countries and drum up the trillions of dollars needed to close it.

At its last preparatory meeting on June 17, the United States rejected the 38-page outcome document that had been negotiated for months by the U.N.’s 193 member nations and announced its ...

At its last preparatory meeting on June 17, the United States rejected the 38-page outcome document that had been negotiated for months by the U.N.’s 193 member nations and announced its ...