We have been studying climate change and potentially associated sea level changes resulting from melting ice and warming oceans for a half century. In the 1970s our primary concern was global cooling and an advancing new ice age. Many believe that increasing quantities of carbon dioxide in our atmosphere could result in rising levels of the sea in general. The record does not show this to be true. There is no evidence whatever to support impending sea-level-rise catastrophe or the unnecessary expenditure of state or federal tax monies to solve a problem that does not exist.

The National Oceanographic and Atmospheric Administration (NOAA) has updated its coastal sea level tide gauge data which continue to show no evidence of accelerating sea level rise. These measurements include tide gauge data at coastal locations along the West Coast, East Coast, Gulf Coast, Pacific Ocean, Atlantic Ocean and the Gulf of Mexico, as well as seven Pacific Island groups and six Atlantic Island groups, comprising more than 200 measurement stations.

The longest NOAA tide gauge record on coastal sea level rise measurements is in New York at the Battery, with its 160-year record which is shown below with a steady rate of sea level rise of 11 inches per century. A slightly slower rate of sea level rise occurs at nearby Kings Point, New York, whose 80-year record also appears below.

Tidal gauges at the Battery (https://tidesandcurrents.noaa.gov/sltrends/sltrends_station.shtml?id=8518750) and Kings Point (https://tidesandcurrents.noaa.gov/sltrends/sltrends_station.shtml?id=8516945) show sea level rising at a pace of 11 inches per century (https://tidesandcurrents.noaa.gov/sltrends/). Both locations show a steady pace of increase, with the same pace of increase holding steady despite periods of relatively rapid temperatures increase and periods of cooling. The Battery measurements date back to 1855, showing the same pace of sea level rise well before the existence of coal power plants and SUVs.

NOAA data provide assessments with a 95% confidence level at all measured locations which demonstrate the consistent behavior of location-specific sea level rise over time. The 2016 updated NOAA tide gauge data include four long-term periods between 92 and 119 years for California coastal locations at San Diego, La Jolla, Los Angeles and San Francisco. The actual measured steady rates of sea level rise at these locations vary between four inches and nine inches per century.

In contrast to the steady but modest rise in sea level, revealed in long-term measurements, the United Nations Intergovernmental Panel on Climate Change (IPCC) speculates that sea level will almost immediately begin rising significantly more than in the past and present. NOAA records contradict such claims. This pattern of steady but modest sea level rise extends throughout the world, throughout times of increasing atmospheric carbon dioxide concentrations, and throughout periods of accelerated warming and cooling.

The IPCC and global warming activists have a difficult time scientifically supporting speculation about accelerating sea level rise, as warming temperatures have yet to push sea level rise beyond one foot per century. Current sea level trends are not significantly different from what they were seven to nine decades ago, when atmospheric CO2 levels were 310 parts per million by volume (ppmv) or less. Dire predictions made decades ago of dramatically accelerating polar ice loss, and an ice-free Arctic Ocean have not come to pass. As Dr. Steven E. Koonin, former Undersecretary for Science for the Obama administration, noted in 2014, “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.”

Fortunately, we don’t need to wonder who is right and who is wrong in the debate over future sea-level rise. We can test the rising-seas hypothesis with real data collected from 10 coastal cities with long and reliable sea level records. Those cities are Ceuta, Spain; Honolulu, Hawaii; Atlantic City, New Jersey; Sitka, Alaska; Port Isabel, Texas; St. Petersburg, Florida; Fernandina Beach, Florida; Mumbai/Bombay, India; Sydney, Australia; and Slipshavn, Denmark.

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This article was published by CFACT and is reproduced with permission.