Prepare for 10 Feet of Sea Level Rise, California Commission Tells Coastal Cities

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According to (This article and its images were originally posted on Scientific American Content September 21, 2018 at 01:01PM.)

California coastal cities should be prepared for the possibility that oceans will rise more than 10 feet by 2100 and submerge parts of beach towns, the state Coastal Commission warns in new draft guidance.

The powerful agency, which oversees most development along 1,100 miles of coast, will consider approving the guidance this fall. A staff report recommending the changes was released last week.

Earlier commission guidance put top sea-level rise at 6 feet by 2100. But according to the new report, there’s the “potential for rapid ice loss to result in an extreme scenario of 10.2 feet of sea level rise” by the end of the century. |

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This article and its images were originally posted on [Scientific American Content] September 21, 2018 at 01:01PM. Credit to the original author and Scientific American Content | ESIST.T>G>S Recommended Articles Of The Day.

 

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One Reply to “Prepare for 10 Feet of Sea Level Rise, California Commission Tells Coastal Cities”

  1. The California Coastal Commission’s draft “warning” is superstition, not science. It’s predicated on the belief that higher CO2 levels causes accelerated sea-level rise. Measured scientific evidence proves that’s untrue.

    Here are several especially high-quality sea-level measurement records:

    https://www.sealevel.info/MSL_graph.php?id=Honolulu
    https://www.sealevel.info/MSL_graph.php?id=Wismar&boxcar=1&boxwidth=3
    https://www.sealevel.info/MSL_graph.php?id=Stockholm&boxcar=1&boxwidth=3

    https://sealevel.info/1612340_Honolulu_Wismar_Stockholm_vs_CO2_annot3.png

    The first two graphs show very typical sea-level trends from especially high-quality measurement records, on opposite sides of the Earth (12 time zones apart, during summer). They’re both at sites which are little affected by distortions like tectonic instability, vertical land motion, and ENSO. The trends are nearly identical, and perfectly typical: only about 6 inches per century.

    The third graph is from Stockholm, at one of many sites were “sea-level rise” is actually negative. It illustrates the fact that the global trend is so tiny that in many places it is insignificant, because it is dwarfed by vertical land motion. Because the land is rising at Stockholm, sea-level is falling there, at a rate of about 18 inches per century (which adds to their dredging expense).

    When I show climate alarmists graphs like those, they usually have a hard time believing it. They often accuse me of cherry-picking. So here is NOAA’s full 2016 list of 375 tide stations, for which they did long term trend analysis; click any of the thumbnails for details:

    http://sealevel.info/MSL_global_thumbnails5.html

    As you can see, none of the longest, best-quality, sea-level measurement records show significant acceleration since the 1920s, or before. (Exception: A very few sites, like Seward, Alaska, had unusual events, causing anomalous measurement records.)

    Even though CO2 levels rose by 101 ppmv (33%), that increase caused no detectable acceleration in sea-level rise.

    “Even though the human influence on climate was much smaller in the past, the models do not account for the fact that the rate of global sea-level rise 70 years ago was as large as what we observe today.”
    Dr. Steven Koonin, former Undersecretary for Science (Obama Administration)

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