Nils-Axel Mörner (born 1938), is the former head of the paleogeophysics and geodynamics department at . He retired in 2005. He was president of the International Union for Quaternary Research (INQUA) Commission on Neotectonics (1981–1989). He headed the INTAS (International Association for the promotion of cooperation with scientists from the New Independent States of the former Soviet Union) Project on Geomagnetism and Climate (1997–2003). He is a critic of the IPCC and the notion that the global sea level is rising. He was formerly the Chairman of INQUA Commission on Sea Level Changes and Coastal Evolution, and led the Maldives Sea Level Project.
Mörner has published books and papers on the interaction among isostasy and eustasy, the oscillating regional eustatic curve of NW Europe, the changing geoid concept, the redefinition of the concept of eustasy, the dynamic-rotational redistribution of oceanic water masses, and the interchange of angular momentum between the hydrosphere and solid Earth. His publications span over thirty years. His most cited paper has been cited about 400 times in early 2017.
Mörner disagrees with the view of future rise in sea level caused by global warming. Mörner's self-published 2007 20-page booklet The Greatest Lie Ever Told, refers to his belief that observational records of sea levels for the past 300 years that show variations - ups and downs, but no significant trend. This contrasts with the usual view that sea level rise has been occurring at 2–3 mm (0.079–0.118 in) per year, over the last century. Mörner asserts that satellite altimetry data indicate a mean rise in the order of 1.0 mm/yr from 1986 to 1996, whereas most studies find a value around 3 mm/yr.
Mörner believes that sea level rise will not exceed 200 mm (7.9 in), within a range of either +100±100 mm or +50 ± 150 mm (2.0 ± 5.9 in), based on satellite data over the last 40 years and observational records over the last 300 years. In 2004 the president of INQUA wrote that INQUA did not subscribe to Mörner's views on climate change.