Study: ‘No Global Acceleration of Sea Level Rise’
5th September 2025
A new study conducted by a Dutch engineering consultant found that the average sea level rise in 2020 was around 1.5 millimeters per year, “significantly lower” than the 3 to 4 millimeters often projected by climate scientists and the Intergovernmental Panel on Climate Change (IPCC).
Hessel Voortman and researcher Rob de Vos checked actual observations of more than 200 tide stations against projections and models.
“It is crazy that it had not been done. I started doing this research in 2021 by doing the literature review. ‘Who has done the comparison of the projections with the observations?’ And there were none,” Voortman told independent journalist Michael Shellenberger.