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9 millimeters is huge! Almost a full centimeter! Way more than the piddly half a centimeter that they estimated before. A centimeter is 2/5 of an inch. That means almost, but not quite, 2 inches every five years. Lets see, 12 inches, divide by 5, carry the one, and we have, uh... Nuts! Too hard.

So it would take thirty years for one foot of coastline to recede. If levees receded at that rate, they would add more dirt. So three feet in a long human lifetime is almost not enough to notice. Also it doesn't account for the natural erosion that happens just because of regular weather. Which, if I read this correctly, would be about half of the new, improved rate.