Sea Levels Were 3 Meters Higher Than Today 5000 Years Ago Along Japan’s Coasts

From NoTricksZone

By Kenneth Richard

Relative sea levels are lower today than at any time in the last 7000 years.

According to 80-year-old aerial photograph evidence, scientists (Nakanishi et al., 2024) report the coastline of their studied area (Hokkaido, Japan) has “receded by approximately 100 m seaward” since 1944. This is a continuation of the long-term, millennial-scale decline in relative sea level.

Accounting for crustal deformations, earthquakes, tsunamis, and vertical land movements (e.g., uplift), the authors conclude relative sea levels were “at least 1 m higher than the present sea level” about 2000 years ago, and a “maximum sea level of +3 m was obtained at 6-4 ka.”

So, ever since about 4000 years ago, when carbon dioxide levels were alleged to be a “safe” 265 ppm, relative sea levels have been falling and CO2 levels have been rising. This negatively correlated pattern has continued into the 20th and 21st centuries.