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Testimonies & Statements
10.30.2026

Lindzen/Happer Comment on Rescission of the Greenhouse Gas Findings for Fossil Fuel-Fired Power Plants

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Richard Lindzen Professor of Earth, Atmospheric, and Planetary Sciences, Emeritus, Massachusetts Institute of Technology William Happer Professor of Physics, Emeritus, Princeton University October 30, 2026   U.S. Environmental Protection Agency Docket Center ID No. EPA-HQ-OAR-2025-0124 1200 Pennsylvania Avenue NE Washington, D.C. 20004 Re: Rescission of the Greenhouse Gas Findings for Fossil Fuel-Fired Power Plants and…
Member Publications
10.27.2026

Saturation of Warming by the Greenhouse Gas CO2

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W. Happer Professor of Physics Emeritus, Princeton University, USA L. Klett Education and Outreach Manager, The CO2 Coalition October 27, 2026 At current atmospheric concentrations C of carbon dioxide (CO2), there is less and less increase of the temperature T as more and more of the greenhouse gas CO2 is added. This law of diminishing…
Member Publications
9.15.2026

The Non-Endangerment Finding: What the Climate Activists Don’t Know or Don’t Want You to Know

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by CO2 Coalition member Stephen Einhorn Introduction This is a booklet about the Endangerment Finding (EF) which is the decision made by the U.S. Environmental Protection Agency (EPA) in 2009 that carbon dioxide (CO₂) endangers public health and welfare and therefore must be regulated. Almost half of all Americans believe that it is the continual…
State and Regional Reports
9.2.2026

Colorado and Climate Change: Colorful Colorado Greener Than Ever

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In 2024, Colorado State University’s Colorado Climate Center published the third edition of its Climate Change in Colorado report (Bolinger et al., 2024) that discusses recent trends and model-based predictions of the climate and hydrology in Colorado. This report claims that “the evidence that human influences have impacted the global climate system has only strengthened.”…
Member Publications
8.21.2026

Human Emissions and Atmospheric Concentrations of Carbon Dioxide

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William Happer, Ph.D., Physics Gregory Wrightstone, M.S., Geology Frits Byron Soepyan, Ph.D., Chemical Engineering August 21, 2026   Assuming that any human-caused increase of atmospheric CO2 concentration decays exponentially to zero, with a time constant of about 50 years, gives modelled concentrations that agree very well with observed concentrations and emissions. Figure 1 shows observed…
State and Regional Reports
8.13.2026

Montana and Climate Change: Carbon Dioxide on Trial

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In March 2020, the Held v. State of Montana “climate lawsuit” was filed against the state government of Montana by a group of 16 Montana youths. They claimed that their government’s support of the burning of fossil fuels exacerbated a climate crisis, which was harming them. The case went to court in June 2023, and…
Testimonies & Statements
8.3.2026

Happer, Lindzen Comment to the Securities and Exchange Commission, Rescission of the Climate-Related Disclosure for Investors Rule

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Richard Lindzen Professor of Earth, Atmospheric, and Planetary Sciences, Emeritus, Massachusetts Institute of Technology William Happer Professor of Physics, Emeritus, Princeton University Comment on the SEC’s Rescission of Climate-Related Disclosure Rule File No. S7-2026-19 (Aug. 3, 2026) THE UNTOLD SCIENCE OF GHGs DEMONSTRATES THE CLIMATE-RELATED DISCLOSURE RULE MUST BE RESCINDED   August 3, 2026 A.…
Member Publications
7.1.2026

Happer/Lindzen Graph: CO2’S WARMING POWER DECREASES VERY RAPIDLY WITH INCREASING CO2

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CO2 AND FOSSIL FUEL EMISSIONS FROM 1750 TO TODAY CAUSED NO EXTREME HEAT, WEATHER OR DAMAGES: JUST MORE FOOD FOR PEOPLE WORLDWIDE AND TRIVIAL WARMING Richard Lindzen Professor of Earth, Atmospheric, and Planetary Sciences, Emeritus Massachusetts Institute of Technology William Happer Professor of Physics, Emeritus, Princeton University July 1, 2026 CO2’S WARMING POWER DECREASES VERY…
Member Publications
4.20.2026

The Peer-Review Problem: A Sedimentological Perspective

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JOURNAL INDIAN ASSOCIATION OF SEDIMENTOLOGISTS ISSN NO 2582 – 2020 Vol. 39, Issue 1, 2022, pp. 3-24 DOI: https://doi.org/10.51710/jias.v39i1.243 G. Shanmugam The Peer-Review Problem: a sedimentological perspective Abstract: Albert Einstein, one of the greatest physicists of all time, had a deep disdain for peer review. The peer-review process, introduced over a thousand years ago in…
Member Publications
5.14.2026

Acidification of Water by CO2

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Acidification of Water by CO2 W. A. van Wijngaarden Department of Physics and Astronomy, York University, Canada P. Ridd Physicist, Adjunct Fellow, Institute of Public Affairs, Malanda, Queensland, Australia M. Cornell Industrial Chemist, Lake Jackson, Texas, USA W. Happer Department of Physics, Princeton University, USA Abstract Fundamental inorganic chemistry shows that increasing concentrations of atmospheric…
Member Publications
4.30.2026

The Seismite Problem

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The Seismite Problem G. Shanmugam Department of Earth and Environmental Sciences, The University of Texas at Arlington, Arlington, TX 76019, USA Abstract During a period of 82 years (1931e2013), 39 genetic terms were introduced for various deposits. Of the 39 terms, only ten are meaningful in understanding the true depositional origin (e.g., turbidites), the remaining…
Member Publications
4.22.2026

Biography William Happer, Ph.D. (Princeton): The Consequential Climate Physicist

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Biography William Happer, Ph.D. (Princeton): The Consequential Climate Physicist G. Shanmugam Department of Earth and Environmental Sciences The University of Texas at Arlington, Arlington, Texas 76019, USA Abstract William Happer, born in Vellore (1939), Tamil Nadu, India is an American icon on Climate Physics. He is currently the Cyrus Fogg Brackett Professor Emeritus in the…
Member Publications
4.24.2026

Fossil Fuel Emissions from 1750 to Today Caused No Harm

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William Happer, Ph.D. Professor of Physics Emeritus Princeton University FOSSIL FUEL EMISSIONS FROM 1750 TO TODAY CAUSED NO HARM (Based on comments to the EPA and OMB) New York and Vermont have Climate Superfund laws and many lawsuits in state courts seek tens of trillions of dollars in damages they assert can be attributed to…
Member Publications
4.22.2026

Fossil fuels, Climate Change, and the Vital Role of CO2 Plays in Thriving People and Plants on Planet Earth

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Bulletin of the Mineral Research and Exploration G. Shanmugam Fossil fuels, climate change, and the vital role of CO2 plays in thriving people and plants on planet earth ABSTRACT A rigorous examination of empirical data confirms the fact that there is no threat from CO2 to People. Fossil Fuels (i.e., Oil, Natural Gas, and Coal)…
Member Publications
4.22.2026

The CO2 Problem: Climate Models vs. Field Measurements

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G. Shanmugam Department of Earth and Environmental Sciences The University of Texas at Arlington, Arlington, Texas 76019, USA ABSTRACT: Developed countries (e.g., USA, Germany, and France) have the unfair advantage over developing countries (e.g., Republic of the Congo, Republic of Kenya, and Sri Lanka) in imposing climate rules that enforce the use of expensive renewable…
Testimonies & Statements
4.10.2026

Open Letter to Federal Judicial Center Chair, Chief Justice John Roberts

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Richard Lindzen, Ph.D. Professor of Earth, Atmospheric, and Planetary Sciences, Emeritus Professor of Physics Massachusetts Institute of Technology William Happer, Ph.D. Emeritus Professor of Physics, Princeton University Steven Koonin, Ph.D. Edward Teller Senior Fellow Hoover Institution, Stanford University   April 1, 2026 The Honorable John G. Roberts Chair, Federal Judicial Center Chief Justice, United States…
Member Publications
11.13.2025

Chill Out: AC Refrigerants Cause Negligible Warming

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Frits Byron Soepyan, Ph.D. November 12, 2025 Abstract The refrigerant R-410A, which has been used in heating, ventilation, and air conditioning (HVAC) systems since 2010, is in the process of being phased out due to the American Innovation and Manufacturing (AIM) Act of 2020 and the regulation passed by the Biden Administration’s United States Environmental…
Member Publications
1.29.2026

Livestock, Methane and Climate

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D. Alexander Methane Science Accord, Clevedon, New Zealand J. D. Ferguson University of Pennsylvania School of Veterinary Medicine, USA A. Glatzle Asociaci´on Rural del Paraguay, Asunci´on W. Happer Department of Physics, Princeton University, USA W. A. van Wijngaarden Department of Physics and Astronomy, York University, Canada January 27, 2026 Abstract Methane emissions by livestock have…
State and Regional Reports
3.24.2026

Virginia and Climate Change (2026 Update) Separating Fact from Fiction

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This updated review of Virginia and Climate Change was commissioned to provide current information to policymakers after multiple climate change-related proposals were made in early 2026 by the newly installed governor and the state legislature. Predicated on the state’s need to reduce greenhouse-gas emissions to forestall a purported climate crisis, the proposals would have huge…
Testimonies & Statements
11.4.2025

William Happer EPA GHGRP Comment Nov. 3, 2025

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William Happer Professor of Physics, Emeritus, Princeton University November 3, 2025 U.S. Environmental Protection Agency Docket ID No. EPA-HQ-OAR-2025-0186 1200 Pennsylvania Avenue NE Washington, D.C. Re: Reconsideration of the Greenhouse Gas Reporting Program (GHGRP) (“Proposed Rule”) Dear Administrator Zeldin, Thank you for the opportunity to comment on the Environmental Protection Agency’s (“EPA”) Proposed Rule.[1] The…
Testimonies & Statements
2.6.2026

Happer – Lindzen CAFE Rule Comment February 2, 2026

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The CO2 Coalition filed its Comment on the National Highway Traffic Safety Administration’s SAFE Rule for Cars and Light Trucks on February 2, 2026. The comment, authored by Drs. William Happer and Richard Lindzen, concluded: Saturation physics demonstrates that the rapid logarithmic decrease in CO2’s power to warm the planet means: Increased CO2 emissions from fossil fuels and other human sources since the beginning of the Industrial Age in…
Member Publications
12.3.2025

Sunlight, the Bond Albedo, CO2, and Earth’s Temperature

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R. Louw Chemical Engineer, Stokesley, England W. A. van Wijngaarden Department of Physics and Astronomy, York University, Canada W. Happer Department of Physics, Princeton University, USA November 27, 2025 Abstract The main determinants of Earth’s absolute surface temperature, T, are the solar constant, S, the Bond albedo, A, and the effective emissivity for thermal radiation,…
Member Publications
10.9.2025

Saturation Graphics

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W. A. van Wijngaarden Department of Physics and Astronomy, York University, Canada W. Happer Department of Physics, Princeton University, USA October 8, 2025 A graphic that has turned out to be helpful for explaining why doubling greenhouse gases has only a tiny effect on thermal radiation to space is a variant of Fig. 4 of…
Testimonies & Statements
9.26.2025

Open Letter to the United Nations Food and Agriculture Organization Concerning Sustainable Livestock Development

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August 21, 2025 Bruno Telemans Yewon Sung FAO Headquarters Viale delle Terme di Caracalla 00153 Rome, Italy Dear Bruno Telemans, Yewon Sung, Thank you very much for your letter politely declining our request for a side event at the FAO Global Conference on Sustainable Livestock Transformation. We sent you a proposal for a parallel event,…
Testimonies & Statements
9.23.2025

CO2 Coalition Comment #2 on EPA Endangerment Finding

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Richard Lindzen Professor of Earth, Atmospheric, and Planetary Sciences, Emeritus Massachusetts Institute of Technology William Happer Professor of Physics, Emeritus, Princeton University September 22, 2025 Re: Reconsideration of 2009 Endangerment Finding and Greenhouse Gas Vehicle Standards; Extension of Comment Period (“Proposed Rule”) U.S. Environmental Protection Agency Docket ID No. EPA-HQ-OAR-2025-0194 1200 Pennsylvania Avenue NE Washington,…

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