The Marshall Islands, east of the Carolines, are divided into two chains: the western, or Ralik, group, including the atolls Jaluit, Kwajalein, Wotho, Bikini, and Eniwetok; and the eastern ...

As Mr. Obama seeks a legacy on climate policy, officials in his administration have quietly encouraged Mr. deBrum to put the Marshall Islands forward as a symbol of the perils of climate change.