There is a very large rat running around in this learned study. Let me explain.
Based on actual events, the Earth has not only experienced this rise in sea level, but has prospered and flourished after it. Enough of a rise to separate Tasmania from Australia.
And yet, just a few feet of speculative sea level rise from "climate change" is going to produce CATASTROPHE.
And inquiring minds want to know: how many coal mines did we have to shut down 50,000 years ago to stop this sea level rise? How many jobs did we have to kill?
Look at how the Australian Aborigines lived. They killed all the jobs. Such heroic self-sacrifice by a culture is unprecedented. This theory will be confirmed when we discover their ancient SUV graveyards, buried somewhere in the outback.
50,000 years ago we were still in the last ice age. Sea levels were much lower than they are now because so much water was tied up in ice. We have been gradually warming ever since. There are ancient American Indian campfire remains that have been found off the coast of North Carolina under 150 feet of water that long ago was dry land. Tasmania was isolated from the rest of Australia only 11,000 years ago. The people who were already living on Tasmania “forgot” such technology as bone sewing needles. The climate change of 10,000 years ago was a big part of what made agriculture possible (starting in the Middle East and Central America), changing just about everything for the human race.
Speaking of ice ages, warm spells typically go all the way to an ice free planet. By that standard, we are still in the last stages of an ice age that started a couple of hundred thousand years ago. Life has survived an ice free world, and we will again. A warmer world is arguably better for human flourishing. Human activity may (or may not) speed up a process that is happening anyway, but it will be slow enough that we can adjust, primarily by moving a bit upland. Current shoreline properties may become unusable, but other property will go up in value. No need to cripple industrial civilization.