Most likely you'll see gradual migrations over the next 100 or so years away from coastal areas, probably not too much larger than typical migrant and infrastructure turnover.
Please stop relying on journalism to make your decisions regarding climate change. It's pure dogma by completely ascientific liberal arts majors.
If you read the IPCC reports yourself (they're huge but you can read the introductory summaries) they're much less certain about the future. Meanwhile alarmism has a real cost now, if you foolishly allow it to influence policy.
And on the subject of habitability, why is it that media rarely, if ever, runs stories regarding the increase in arable land that comes with thawing permafrost? How much habitable land will be gained from climate change?
And just to emphasize the short sightedness of "banning" fossil fuels as you originally proposed, good luck getting food and medical equipment (and pretty much anything else) to the hundreds of millions of people living in cities without diesel for trucks.