Those who argue human greenhouse gas emissions are causing dangerous climate change regularly point to rising seas as one of the most certain and devastating impacts on human communities.According to environmental activists, mainstream media outlets and some scientists—who routinely cite Intergovernmental Panel on Climate Change (IPCC) reports—unless governments take drastic action to transform the world’s economic system, including ending the use of fossil fuels for energy in a very short period, entire island nations will disappear beneath the seas and low-lying coastal cities will be swamped, forcing a great migration of populations inland.The threat of rising seas to various communities...