New Multi-Agency Estimate: Up To 8 Feet Of Sea-Level Rise By 2100

New federal estimates say global sea levels could rise faster than previously thought, and the rise may be even worse in many coastal regions of the United States. A new report, written by scientists with several federal agencies and universities, says that under a worst-case scenario, climate change could raise the oceans an average of more than 8 feet by 2100, about 20 inches more than a previous federal estimate published in 2012. The best case now projected would be an average of about a foot.

The report was delivered just as President Donald Trump took office, immediately working to undo President Barack Obama's climate policies. On his inauguration day, pages mentioning climate change on whitehouse.gov were removed. Trump has promised policies to increase fossil fuel development in the U.S., and to undo Obama's major emissions-cutting initiative, the Clean Power Plan.

Sea level rise will likely be worse in some regions of the U.S. because of ocean currents, wind patterns and settling sediments. The authors examined six scenarios with a range of probabilities in an effort to help state and local governments plan for sea level rise. Under all of them, the Northeast should expect higher waters than much of the rest of the globe. The Pacific Northwest and Alaska would likely experience lower-than-average increases under the best-case scenarios.

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The report also warned that moderate coastal flooding will become 25 times more likely with a 14-inch rise in the seas. That level could come anytime from 2030 to 2080 for most coastal cities, depending on their location and the world's emissions. It would mean that a flood that now comes once every five years would be expected five times a year.

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https://insideclimatenews.org/news/24012017/sea-level-rise-global-warming-federal-report-donald-trump