are climate change deniers naturally gullible?, page-32

"Yes. At Cape Ferguson it is approx 6mm /yr. A rise too small to be "noticed" by anything other than scientific measurement."

Hanarahan, a rise of 6mm per year is 6cm in 10 years. If the beach you are on has a gradient of 1 in 50 (a gentle gradient apparently), then that rise equates to 3 metres of land in 10 years, 30 metres of beach gone in 100 years!

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"Beach gradients are usually described as-

-Steep (more than 1:15).

-Moderate (1:15 to 1:30).

-Gentle (1:30 to 1:60).

-Mild (1:60 to 1:120).

-Flat (less than 1:120)."

http://www.globalsecurity.org/military/library/policy/army/fm/55-50/Ch11.htm