Sea-level rise will raise groundwater in coastal areas, and release toxic chemicals that people have buried there. To avoid poisoning people and animals, we will need to dig out those areas and convert the toxins. The resulting ponds can be very useful -- for floating neighborhoods, as in the Netherlands.

I doubt that poor countries will have the means to do this. I think that hundreds of millions of the inhabitants of those regions will have to struggle to survive. Some will survive by being terribly exploited, and the rest will die. And it is too late to avoid this by reducing greenhouse emissions now.

Those peoples can reduce the number of people who suffer those effects by having fewer children.