Hugh W. Ellsaesser

Hugh W. Ellsaesser


  • Ph.D., Meteorology. [1]


A meteorologist by training, Ellsaesser is a retired “guest scientist” at the Lawrence Livermore National Laboratory, and a widely-quoted global warming skeptic.

He is “CEO of HWE Atmospheric Consultant.” [1]

Stance on Climate Change

“… I am one of the strong supporters of the proposition that the available records indicate climate warming over the past century or so. It's just that I don't believe the observed warming is due to an increase in greenhouse gases.” [2]

Key Quotes

“In considering the question of human activity and climate change it is essential to distinguish between global warming, which is a progressive increase in the annual mean global temperature, and human-activity-induced greenhouse warming, as may, for example, be caused by the release of greenhouse gases into the atmosphere as a result of fossil fuel combustion or deforestation.” [1]

Key Deeds

November 1996

Ellsaesser questioned the validity of government action on ozone depletion and reducing the use of CFC's. In a November 1996 article he said that “The public has been misled to an even great extent in that the possible beneficial consequences of increased UV have been consistently ignored.” [3]

April, 2006

Ellsaesser was one of the signatories of the 2006 open letter to Prime Minister Harper that urged inaction on climate policy while denying the existence of human-caused, or anthropogenic, global warming.

May, 2000

Ellsaesser was part of a group created to examine the IPCC's third assessment report. The group was assembled by the Science and Environmental Policy Project (SEPP).

The group contained 14 “climate scientists” that made up SEPP's “Science Integrity Team.” The team set out to present its findings “in plain English” to congress and the media—findings which suggested a lack of significant or human-caused global warming while concluding that “if the earth were to warm slightly, and atmospheric CO2 were to increase, the effects would be mostly beneficial.”

Others who participated in SEPP's briefing included David Wojick, Richard Courtney, Vincent Gray, Wibjorn Karlin, Ross McKitrick and numerous other global warming skeptics. [4]


  • Environmental Conservation Organization (ECO)Advisor. [10]


According to an ISI database search of publications, Ellsaesser has not been published in a peer-reviewed scientific journal since 1984.


  1. Re: Global warming: It's happening,” Letter to NaturalSCIENCE.

  2. Environ. Sci. Technol., 1991, 25 (7), pp 1186–1186 (ES&T Letters).

  3. Hugh W. Ellsaesser. “Reassessing the Montreal Protocol: Health and biological effects of increased UV exposure may be overestimated,” Committee for a Constructive Tomorrow, November 1, 1996. Archived October 28, 2007.

  4. What's wrong with U.N. climate science: An independent scientific review of the IPCC's Third Assessment Report” (News Release), Science and Environmental Policy Project, May 25, 2000. Archived February 15, 2007.

  5. THE ADVANCEMENT OF SOUND SCIENCE COALITION [defunct],” Integrity in Science. Accessed December 7, 2011.

  6. CFACT Board of Advisors,” Accessed December 7, 2011.

  7. Natural Resources Stewardship Project 'Allied Experts',” The Natural Resources Stewardship Project. Archived February 19, 2009.

  8. Hugh W. Ellsaesser,” SourceWatch Profile.

  9. Staff,” Consumer Alert. Archived April 2, 2003.

  10. Board of Directors and Advisors,” Archived April 15, 2007.

  11. Hugh W. Ellsaesser. “What you never hear about greenhouse warming,”

  12. Greenpeace Investigations on Hugh Ellsaesser.

  13. ExxonSecrets Factsheet: Hugh Ellsaesser.

  14. Deniers:Scientists:Hugh Ellsaesser,” ExxonSecrets Wiki.