Small waves crash over rocks across the harbor from the Sydney city skyline May 23, 2011. REUTERS/Tim Wimborne


Sea levels could rise by a greater-than-expected six meters (20 ft) over many centuries even if governments cap global warming around current levels, scientists said on Thursday, based on clues from an ancient warm period...



Sea levels have risen by about 20 cms (8 inches) in the past 100 years, with a thaw of ice from Greenland to Antarctica spilling water into the oceans. Many studies have assumed that rising temperatures are a condition for a much faster melt.

A study in the journal Science, however, said sea temperatures in a natural warm period about 125,000 years ago were "indistinguishable" from today, rather than up to 2 degrees Celsius (3.6 Fahrenheit) hotter as previously thought.

"The trend is worrisome as sea levels during the last interglacial period were between six and nine meters (20-30 ft) above their present height," Science said of the findings led by Jeremy Hoffman at Oregon State University.

The experts studied deep seabed sediments, containing chemical signals of temperatures, at 83 sites. It can take centuries or thousands of years for rising temperatures to thaw vast ice sheets.

"The study suggests that, in the long term, sea levels will rise 6 meters at least in response to the warming we are causing," said Andrew Watson, a professor at Britain's University of Exeter who was not involved in the research.

"The good news is that with luck it will continue to rise slowly so that we have time to adapt, but the bad news is that eventually all our present coastal city locations will be inundated," he wrote in a comment.

Anders Levermann, a professor at the Potsdam Institute for Climate Impact Research, said the study was a hint both that ice sheets would melt at lower temperatures than previously expected and also more rapidly.

"It could mean that sea levels will respond faster" to global warming, he told Reuters. He added that there were still many uncertainties about inferring rates of sea level rise from the pre-historic temperatures.

On Wednesday, the U.N.'s World Meteorological Organization said that average global surface temperatures hit a record high in 2016 for the third year in a row and were 1.1 degree Celsius (2.0°F) higher than in pre-industrial times.

By Alister Doyle | OSLO
Fri Jan 20, 2017 | 3:58am EST

(Editing by Gareth Jones)


original story HERE


If you would like to share this blog story on Facebook with one easy click, scroll down to the very bottom of this page and look for the SHARE button along with the Facebook LIKE button under the "Sign up to Learn About & Help End Global Warming” boxed area where people enter their email address. You do not need to enter any email address to use the one click Facebook SHARE button.

Get more of The Global Warming Blog. Bookmark this page and signup for the blog’s free RSS Feed. Sign up for free Global Warming Blog by clicking here. You will automatically be emailed a regular summary of the latest global warming headlines.

To learn about more about global warming, climate change or greenhouse gases as well as the causes, consequences, solutions, definitions, facts and tipping points related to these subjects, click here.
To see our most current positions, opinions, comments, agreement or disagreement with this article, and/or possible criticisms related to the subjects or facts raised in the above article, click here.  Then look for those subjects in the navigation links at the top the page.

To sign a critical petition for declaring an international global warming State of Emergency, click  here!

To help do something about the climate change and global warming emergency, click here.

Sign up for our free Global Warming Blog by clicking here. (In your email, you will receive critical news, research, and the warning signs for the next global warming disaster.)

To share this blog post: Go to the Share button to the left below.

Be the first to comment

Please check your e-mail for a link to activate your account.
Get More Info Here Take Action Support Our Mission

Subscribe to Our Global Warming Blog


Subscribe to Our Global Warming Blog