Eseta Vusamu sits near the water Thursday, Sept. 29, 2022, in the village of Faleasiu on the island of Upolu in Samoa. When and if an island nation fully submerges due to climate change, what happens to the nationalities of its citizens? “If you ask our people to move, there is no way we would voluntarily leave,” Vusamu said. (AP Photo/Lagipoiva Cherelle Jackson)