On Jan. 20, a 20-foot wave crashed into a community center on a U.S. military base in the Marshall Islands. The wave broke down the door, smashed windows and even dragged people under. Waves and storm-driven flooding aren’t uncommon in the Marshall Islands. But this one hit a base that’s vital to U.S. national security. It’s where the United States conducts missile testing. Very few people ever see this remote and fortified location on a tiny island halfway between Hawaii and Australia. Host Kai Ryssdal treks across the Pacific to find out how our military will respond to the existential climate threat, and asks: What do rich countries and major carbon emitters like the U.S. owe to the people and nations bearing the brunt of the climate crisis?