“Private insurance companies, who make it their business to assess risk, won’t touch flood insurance by the sea. Do they know something we don’t?” A Hole In The Wind by David Goodrich, Pegasus, 2017
Yes, they do, and the answer has been obvious for quite a while, much to the chagrin of deniers!
From about 2008 (with an update in 2015) Skeptical Science the article “How much is sea level rising?” https://www.skepticalscience.com/sea-level-rise.htm tells the story in a nutshell!
In 2011 , two scientists from the Centre for Australian Weather and Climate Research—A Partnership Between CSIRO and the Australian Bureau of Meteorology, and CSIRO Wealth from Oceans Flagship CSIRO Marine and Atmospheric Research in Hobart, Australia published a seminal study entitled “Sea-Level Rise from the Late 19th to the Early 21st Century“.
Yeah, it’s science and it could be boring for those who do not appreciate science, but it provides a remarkable insight into what has happened in the last hundred years or so due to man’s influence on nature.
We estimate the rise in global average sea level from satellite altimeter data for 1993–2009 and from coastal and island sea-level measurements from 1880 to 2009. For 1993–2009 and after correcting for glacial isostatic adjustment, the estimated rate of rise is 3.2 ± 0.4 mm year?1 from the satellite data and 2.8 ± 0.8 mm year?1 from the in situ data.
The global average sea-level rise from 1880 to 2009 is about 210 mm. The linear trend from 1900 to 2009 is 1.7 ± 0.2 mm year?1 and since 1961 is 1.9 ± 0.4 mm year?1.
There is considerable variability in the rate of rise during the twentieth century but there has been a statistically significant acceleration since 1880 and 1900 of 0.009 ± 0.003 mm year?2 and 0.009 ± 0.004 mm year?2, respectively.
Since the start of the altimeter record in 1993, global average sea level rose at a rate near the upper end of the sea level projections of the Intergovernmental Panel on Climate Change’s Third and Fourth Assessment Reports.
However, the reconstruction indicates there was little net change in sea level from 1990 to 1993, most likely as a result of the volcanic eruption of Mount Pinatubo in 1991.
Reference: DOI 10.1007/s10712-011-9119-1
Year of Publication 2011
Authors Church, J., and N. White
Reference: Journal Surveys in Geophysics
Date Published 03/2011
Keywords sea_level, tide_gauge
Climate.gov has more recent deatils online at: https://www.climate.gov/news-features/understanding-climate/climate-change-global-sea-level.