I don’t know how accurate these projections are, but assuming they are, this is flat out alarming. By 2050, 300 million people living in coastal cities could be forced to move to higher ground. Cities in Asia would be predominately affected such as Shanghai, China. These numbers are higher than scientists/climatologists previously thought. They’ve known about the rising sea levels, but what they didn’t know was how many people are projected to be affected. That’s what has them so alarmed. 

Of course, it’s not just a function of water rising. It is water rising that will in turn give rise to more powerful storms, which will in turn lead to more drastic flooding, etc. As I said earlier, this is truly alarming and hopefully our planet wakes up to just how dangerous and real this threat is. We have nothing to gain by ignoring this.