Here, it just means that the UN are metaphorically shouting, they're appealing for people to come together and support these Pacific islands by helping reduce climate change and rising sea levels.
在这里, 这只
意味着联
国在隐喻地喊叫,他们呼吁人们团结起来, 通过帮助减少气候变化和海平面上升来支持这
太平洋岛屿。