Sherwood B. Idso

Sherwood B. Idso (Deceased)



Sherwood B. Idso was the president of the Center for the Study of Carbon Dioxide and Global Change from 2001 to 2018. He ran the Center with his two sons, Craig Idso and Keith E. Idso. He later held an advisory role at CSCDGC.4Emeritus President,” CO2 Science. Archived January 14, 2020. URL: He passed away on June 12, 2024.5In Loving Memory: Sherwood Burtrum Idso,” Tempe Mortuary. Archived June 26, 2024. Archive URL:

The Center was listed as one of Mother Jones magazine’s 2009 global warming skeptic “Dirty Dozen of Climate Change Denial.”6 Josh Harkinson. “The Dirty Dozen of Climate Change Denial: No. 8: Center for the Study of Carbon Dioxide and Global Change (A.K.A. The Idso Family)”, Mother Jones, December 4, 2009.

Sherwood Idso received the Petr Beckmann Award from Doctors for Disaster Preparedness (DDP) in 2003 for “courage and achievement in the defense of scientific truth and freedom”. It was given “for his work demonstrating the fertilizing effect of increased carbon dioxide on the biosphere.”7 DOCTORS FOR DISASTER PREPAREDNESS NEWSLETTER, Vol. XX, No. 4 (July 2003). Archived March 18, 2007. 8 Sherwood Idso. “On Accepting an Award,” Co2Science, Volume 6, Number 30, Supplemental: 23 July 2003.

According to his profile at CO2 Science, he served on the editorial board of Agricultural and Forest Meteorology from 1973 to 1993 and since 1993 has served on the editorial board of Environmental and Experimental Botany. He was also was honored with an Arthur S. Flemming Award due to his early work in remote sensing.

Stance on Climate Change

“I find no compelling reason to believe that the earth will necessarily experience any global warming as a consequence of the ongoing rise in the atmosphere’s carbon dioxide concentration.”9 Sherwood B. Idso. “Real-World Constraints on Global Warming,” The Fraser Institute, October 20, 1999.

Key Quotes

“Since something other than atmospheric CO2 variability was […] clearly responsible for bringing the planet into the Little Ice Age, something other than atmospheric CO2 variability may just as well have brought the planet out of it.”10The Medieval Warm Period and Little Ice Age: Their Untimely Demise and Welcome Resurrection,” CO2 Science, Volume 5, Number 13 (March 27, 2002).

Key Deeds

November 2003

Contributed to a Center for the Study of Carbon Dioxide and Global Change publication titled “Enhanced or Impaired? Human Health in a CO2-Enriched Warmer World” (PDF).11 Sherwood B. Idso, Craig D. Idso and Keith E. Idso. “Enhanced or Impaired? Human Health in a CO2-Enriched Warmer World” (PDF), Center for the Study of Carbon Dioxide and Global Change, November, 2003.

The paper, which Idso co-authored with his sons Craig D. Idso and Keith E. Idso, sets out to “evaluate a second climate-alarmist scare story: the claim that CO2-induced global warming will have numerous deleterious effects on human health” and to “describe and evaluate a number of non-climatic effects of atmospheric CO2 enrichment that impact human health.”

The paper concludes that “it is abundantly clear we have nothing to fear from increasing concentrations of atmospheric CO2 and global warming, i.e., the ‘twin evils’ of the extreme environmental movement. Indeed, these phenomena would appear to be our friends […] and friends of the entire biosphere.”

With the consistent use of terms such as “alarmist” and “extreme environmental movement,” it is difficult to view this as an impartial scientific study.

July 2003

Spoke at the 21st Annual Meeting of the Doctors for Disaster Preparedness (DDP) held in Phoenix, Arizona. He discussed the supposed benefits to plants of a CO2-enriched atmosphere.

July 1991

Idso was one of three members of a “science advisory panel” for a pro-coal ad campaign funded by coal-burning utility companies. The campaign had the goal to “reposition global warming as theory” and not fact.12 Matthew L. Wald. “Pro-Coal Ad Campaign Disputes Warming Idea,” The New York Times, July 8, 1991.

The other panel members included prominent climate change skeptics Robert C. Balling Jr., and Patrick J. Michaels.


Idso narrated the video titled “The Greening of Planet Earth,” which was funded by the Western Fuels Association and by the coal industry and produced by Idso’s wife. The video promises that doubling the atmosphere’s concentration of carbon dioxide will benefit agriculture.13U.S. Coal Industry: Global Warming Is Good For Us,” The Heat Is Online.

Idso also appeared in the video to discuss the supposed benefits of CO2:14The Greening of Planet Earth (1992),” YouTube video uploaded by user “co2science,” June 24, 2013. Archived .mp4 on file at DeSmog.


Authored a book titled Carbon Dioxide: Friend or Foe? An Inquiry Into the Climatic and Agricultural Consequences of the Rapidly Rising CO2 Content of Earth’s Atmosphere. (Tempe, Ariz. IBR Press 1982). According to one review, the book addresses “the climatic and agricultural consequences of rising carbon dioxide content in the earth’s atmosphere, and the conduct, or misconduct, of science.” In the book, Idso suggests climate models and that “the U.S. National Research Council, the U.S. National Academy of Sciences, and certain climate-modellers have conspired to suppress any challenge to this prediction.”15 Arctic, Vol. 36. No. 2. (1983). Archived August 1, 2018. URL:



According to a search of Google Scholar, Sherwood B. Idso has published numerous articles in peer-reviewed journals. Many of his papers are focused on agricultural meteorology and remote sensing.

Other Resources


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