- Rising sea levels could swamp major cities and displace almost 200 million people, scientists say | With a “business as usual” approach to carbon emissions, the world's oceans could plausibly rise two meters by the end of the century. https://www.nbcnews.com/mach/science/rising-sea-levels-could-swamp-major-cities-displace-almost-200-ncna1008846 26 comments politics