In an article which describes Karlén as a paleoclimatologist, he is quoted as saying: "One of the big problems with trying to determine long-term temperature changes, is that weather records only go back to about 1860. By relying on statistical reconstruction of the last 1000 years, using only the temperature patterns of the last 140 years instead of actual temperature readings, the IPCC report and Summary missed both a major cooling period as well as a significant warming trend during that millennium." Karlén has also criticized the mainstream media for "spreading the exaggerated views of a human impact on climate." He was also named in a 2007 minority report of the U.S. Senate Environment and Public Works Committee as one of 400 "prominent scientists" who were said to dispute global warming. In 2010, he predicted that natural climate changes to caused to a large degree by the sun's activity would more likely make the climate colder than warmer in the next decades.
He is a contributing author to the Fraser Institute 2007 Independent Summary for Policymakers.
- Karlen, Wibjorn (30 May 2000). "Kyoto's Fatal Flaws Revealed". sepp.org. Retrieved 2007-04-06.
- Opinion: Editorial: Global warming 'consensus' a fiction - OCRegister.com
- : U.S. Senate Committee on Environment and Public Works :: Minority Page :
- Wibjörn Karlén (7 January 2010) Lilla istiden kan redan vara här Expressen. Retrieved 16 January 2014 (Swedish)
- Wibjörn Karlén Kungliga Vetenskapsakademien. Retrieved 16 January 2014 (Sami)