Sea Level Rise
... could displace 1/5 of the world's population by 2100.
That sounds low to me. So many people live in coastal cities, and most of those will get washed away by rising water and/or storms (which are connected) followed by -- and this is likely something they're missing -- further upheavals and displacements as the former beach slumps inland. Especially near saltwater, things that grow by the beach have to be tougher than those inland. I don't think they're accounting for farms lost to salt winds as the beachline moves, or the loss of supporting cities as their former customers on the coast evacuate, just to give a couple of examples.
That sounds low to me. So many people live in coastal cities, and most of those will get washed away by rising water and/or storms (which are connected) followed by -- and this is likely something they're missing -- further upheavals and displacements as the former beach slumps inland. Especially near saltwater, things that grow by the beach have to be tougher than those inland. I don't think they're accounting for farms lost to salt winds as the beachline moves, or the loss of supporting cities as their former customers on the coast evacuate, just to give a couple of examples.