There are places like Marshall islands where relocation inland is not an option (unlike the millions of coastal population) and a significant sea level rise will simply eliminate them as dryland.<p>However, those places are comparatively small. Compared to the massive scale of anything we must start&#x2F;stop doing to actually change global warming, for solving the particular issue of Marshall islands simply relocating the 70 000 people is the easiest and simplest solution with less impact on people lives.<p>A smallish military conflict displaces more civilians than that. In a sea level rise, the likely sea border disputes as islands disappear will impact far more people than those who live in atoll nations, their combined number of people is so tiny compared to, say, a couple coastal towns in Bangladesh.