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BONN, Germany — Fijian singers strumming ukuleles serenade delegates to the United Nations climate talks as they enter the conference hall. A traditional two-hulled sailing craft, or drua, is on display by the entrance to signify that when it comes to rising seas, all nations are in the same boat.

But as two weeks of negotiations on bolstering the Paris agreement draw to a close, island leaders say the décor seems a cruel taunt.

Fiji, a sunny island nation in the South Pacific, is the official host of the climate discussions here in chilly Bonn. But leaders say their hopes that island issues would take center stage have mostly been dashed. Almost none of the measures to help their countries adapt to the impacts of global warming have been resolved, and few delegates say they are hopeful the final hours of talks will bring decisions.