I think most developed countries will find themselves debating over how many climate migrants to take in. Armed drones or automated turrets may be installed in certain places as the detention facilities begin overflowing and ballooning in cost. There will likely be a lot of underground humanitarian groups smuggling in/sheltering migrants. Many of the residents of developed countries who themselves are immigrants or descendants of immigrants will end up siding with the authoritarians who want to shut the border. There will be a lot of fighting within these families. It will get nasty very fast.
Label: no hate