I'll leave aside the wider issues of climate change for a moment and address sea level rises alone, since it's one of the big scary points due to fears of mass coastal migrations inland.
Anyhow, for a bit of perspective, NASA's own research on potential sea level rises argues that in the worst case scenario for climate warming, we should see a rise of just over a meter by 2100 and a possible rise of 5 meters by 2300. Now, if you like, go to, for example (though it only focuses on the United States) NOAA's map tool for visualizing different levels of rising water. (1)
See for yourself what a one meter rise looks like and then also a completely drastic 300-year 5 meter increase. To be sure, both would be major problems for millions of people and huge tracts of coastal land, but bear in mind that these people and the governments/private interests/individuals responsible for those areas would have from ONE TO THREE centuries to prepare.
This is a lot of time even for slow measures at current technology and resources to prepare remarkably well. It's reasonable to suppose that over the next 100 years (barring some other different catastrophe), we'll have even better technology and resources at our disposal, especially if the water visibly starts to go up and coastal fresh water table salinity starts to grow large enough to cause crop failures. At least as far as sea level rises are concerned, solutions are completely manageable.
The doom scenarios for rising oceans are grotesquely overblown by a large base of people who just can't seem to emotionally help themselves in not specifically and forcefully insisting on catastrophic situations, despite millennia of humanity showing just how adaptive it is and despite the literal best science on the matter arguing for something that is much less catastrophic when actually examined.
1. https://coast.noaa.gov/slr/#/layer/slr/10/-11581024.66377982...
NASA sea level rise predictions https://earthobservatory.nasa.gov/images/148494/anticipating...