The more interesting part to me: at the +4 C warming, a lot of currently most productive and populous areas in subtropics will become too hot for humans to live. This will lead to deaths, migrations, and, of course, food insecurity.
Also, melting of enough of Antarctic ice may raise the level of oceans so much that protecting coastal cities with dams will become impractical. That is, whole countries, like the Netherlands, currently have a lot of their territory below sea level, and had for centuries. But this only works for a difference of several meters, but is unlikely to work for e.g. 50m.
Also, melting of enough of Antarctic ice may raise the level of oceans so much that protecting coastal cities with dams will become impractical. That is, whole countries, like the Netherlands, currently have a lot of their territory below sea level, and had for centuries. But this only works for a difference of several meters, but is unlikely to work for e.g. 50m.