A new study warning that rapidly melting ice sheets in Greenland and Antarctica may push global sea level rise beyond 7.8 feet by 2100 has elicited alarm about the “profound consequences for humanity” and cast doubt on past projections.
“If we see something like that in the next 80 years we are looking at social breakdown on scales that are pretty unimaginable.”
—Jonathan Bamber, lead author
“If we see something like that in the next 80 years we are looking at social breakdown on scales that are pretty unimaginable,” lead author Jonathan Bamber, a professor of physical geography at the U.K.’s University of Bristol, told New Scientist.
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The structured expert judgement study, published Monday by the peer-reviewed journal brought together 22 experts.
Under the experts’ worst case scenario projection—based on global temperatures increasing to 5°C (9°F) above pre-industrial levels by 2100—rising seas would leave about 1.79 million square kilometers (691,123 square miles) underwater and displace up to 187 million people.
Detailing what this would look like on a global scale, BBC News reported:
Much of the land losses would be in important food growing areas such as the delta of the Nile. Large swathes of Bangladesh would be very difficult for people to continue to live in. Major global cities, including London, New York and Shanghai would be under threat.
“To put this into perspective, the Syrian refugee crisis resulted in about a million refugees coming into Europe,” said [Bamber].
“That is about 200 times smaller than the number of people who would be displaced in a two meter sea level rise.”
Fifth Assessment Report of the Intergovernmental Panel on Climate Change’s (IPCC). That 2013 U.N. analysis, which experts have long criticized as too conservative, concluded that under business-as-usual greenhouse gas emissions, global sea level could rise up to 3.22 feet by the end of this century.
“The IPCC report in 2013 only considered what is ‘likely’ to happen, which in scientific terms means they looked at 17-83 percent of the range of possibilities,” explained BBC News. “This new study looks at a broader range of results, covering 5-95 percent of the estimates.”