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Testimonies & Statements
6.13.2025

Physics Demonstrates That Increasing Greenhouse Gases Cannot Cause Dangerous Warming, Extreme Weather or Any Harm

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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 PHYSICS DEMONSTRATES THAT INCREASING GREENHOUSE GASES CANNOT CAUSE DANGEROUS WARMING, EXTREME WEATHER OR ANY HARM More Carbon Dioxide Will Create More Food. Driving Greenhouse Gas Emissions to Net Zero and Eliminating Fossil Fuels…
Testimonies & Statements
6.10.2025

Comment on the 5th National Climate Assessment 3d Order Draft

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Comment on the 5th National Climate Assessment 3d Order Draft William Happer, Professor of Physics, Emeritus, Princeton University Richard Lindzen, Alfred P. Sloan Professor of Atmospheric Science Emeritus Massachusetts Institute of Technology CO2 Coalition Gregory Wrightstone, Executive Director Non-profit 501(c)(3) educational foundation January 27, 2023 The 5th National Climate Assessment 3rd Order Draft is Fatally Flawed Science…
Testimonies & Statements
5.27.2025

Gold Standard Science

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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 Gold Standard Science May 25, 2025 The material below concerning how scientific knowledge is determined was drawn from the report Greenhouse Gases and Fossil Fuels Climate Science (4/28/25). II.  SCIENTIFIC KNOWLEDGE IS DETERMINED…
Member Publications
5.1.2025

Chemtrails or Contrails?

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By Roy W. Spencer, Ph.D. May 1, 2025 Cirrus clouds have been around forever. Cloud types were first named by English pharmacist Luke Howard in 1802 using Latin terms. Cirrus clouds refer to their hair-like appearance, but they can take on many shapes depending upon conditions such as humidity, the rate at which air is…
Member Publications
5.14.2025

A Response to “Carbon Majors and the Scientific Case for Climate Liability”

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By Bruce M. Everett, Ph.D. May 8, 2025 Climate activists insist that (1) the narrative of catastrophic warming is rigorously formulated and beyond refutation and (2) oil and gas companies are global villains that should be brought to account for their sins. The recently published Nature article “Carbon Majors and the Scientific Case for Climate…
Climate Issues in Depth
1.31.2025

Radiation Transport in Clouds

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By W. A. van Wijngaarden and W. Happer January 2, 2025 Abstract We briefly review the dominant role of clouds in Earth’s climate. The earliest observational studies of heat transfer through Earth’s atmosphere, for example, those of John Leslie around 1800, showed that clouds have a large effect on radiative heat transfer from Earth’s surface…
Science & Policy Briefs
1.15.2025

Gases from Asthma Inhalers Cause Negligible Warming

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Frits Byron Soepyan January 2025 Abstract: Various educational and medical institutions, as well as policymakers, have expressed concerns regarding the use of metered-dose inhalers to prevent or treat shortness of breath associated with asthma and chronic obstructive pulmonary disease (COPD), as these inhalers use hydrofluorocarbons (HFCs), which are greenhouse gases, as propellants. In response, “environmentally…
Climate Issues in Depth
1.8.2025

Methane and Climate

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The paper’s Abstract explains that while the “radiative forcing” of each methane molecule is indeed 30 times larger than that of a carbon dioxide molecule, the increase in global methane is 300 times less than that of carbon dioxide. As a result, methane is only one tenth (30/300) as powerful in forcing as carbon dioxide, which adds about a degree Celsius to global warming as it doubles in the atmosphere. A methane doubling would provide only a tiny fraction of total greenhouse forcing, the paper says....
Member Publications
12.30.2024

Lightfoot and Ratzer, a Response: Why an Equation of State Alone Cannot Model Atmospheric Dynamics

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By Kevin Kilty, Ph.D., P.E. CO2 Coalition Member Retired Mechanical Engineering faculty member, University of Wyoming Among the many attempts to demonstrate that CO2 has little to no effect on climate are several that purport to use an equation of state as their basis. A recent example by Lightfoot and Ratzer is entitled “The Sun…
Member Publications
12.12.2024

Human Contribution to Atmospheric CO2: How Human Emissions Are Restoring Vital Atmospheric CO2

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Ferdinand Engelbeen, Renee Hannon, and David Burton December 2024 Since the beginning of the Industrial Revolution in the late 1700s, the average concentration of Earth’s atmospheric carbon dioxide (CO2) has increased by about 140 parts per million by volume (ppmv) to the current amount of about 420 ppmv. This is much higher than concentrations of…
Science & Policy Briefs
12.12.2024

Emissions of Anesthetic Gases Cause Negligible Warming

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Frits Byron Soepyan, William Happer, Gregory Wrightstone December 2024 Abstract: There is a growing concern in the medical industry regarding the emission of anesthetic gases, such as sevoflurane, nitrous oxide, isoflurane and desflurane, into the atmosphere, because these anesthetic gases are greenhouse gases. To determine if these concerns are sensible, we compiled the information regarding…
Testimonies & Statements
4.30.2025

Greenhouse Gases and Fossil Fuels Climate Science

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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 April 28, 2025 SUMMARY At the outset it is important to understand that carbon dioxide has two relevant properties, as a creator of food and oxygen, and as a greenhouse gas (GHG). As…
Testimonies & Statements
10.23.2024

CO2 Coalition: Don’t Waste Money on CO2 Removal

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Submitted by: Gregory Wrightstone, Executive Director Frits Byron Soepyan, Research and Science Associate CO2 Coalition, Arlington, Virginia October 22, 2024 to the Wyoming Energy Authority We recommend against the expenditure of Wyoming tax revenues to study or implement the removal of carbon dioxide from the atmosphere or from the effluents of power plants and other…
Testimonies & Statements   -  Featured
9.10.2024

Expert Opinion Filed: Hague Court of Appeals in Shell v. Milieudefensie

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This expert opinion was filed September 10, 2024 Court of Appeals The Hague The Hague The Netherlands Richard Lindzen Professor of Earth, Atmospheric, and Planetary Sciences, Emeritus Massachusetts Institute of Technology William Happer Professor of Physics, Emeritus Princeton University Steven Koonin University Professor, New York University, Senior Fellow at the Hoover Institute Re: Shell v.…
Testimonies & Statements
8.15.2024

Open Letter to National Renewable Energy Laboratory RE: Los Angeles 100% Renewable Energy Study

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August 12, 2024 Jaquelin Cochran, PhD Director, Grid Planning and Analysis Center National Renewable Energy Laboratory Re: CO2 Coalition Challenges Climate Basis for LADWP LA100 Dear Dr. Cochran: Good news: There is NO climate crisis in California. This letter regards the Los Angeles 100% Renewable Energy Study (LA100), which is a joint collaboration between the…
Testimonies & Statements
7.15.2024

Two Important Supreme Court Cases Strongly Support the CO2 Coalition’s Supreme Court Strategy

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July 14, 2024 Two recent Supreme Court cases validate the CO2 Coalition’s Supreme Court Strategy to file comments that can be used in briefings by those challenging various Net Zero regulations in the Courts of Appeal and then the Supreme Court.   Coalition comments were filed by Drs. William Happer (Princeton) and Richard Lindzen (MIT) in…
Testimonies & Statements
7.12.2024

Physics Proves Net Zero Carbon Dioxide Will Prevent Very Little Warming but Cause Great Harm

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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 Physics Proves Net Zero Carbon Dioxide Will Prevent Very Little Warming but Cause Great Harm July 4, 2024 The United States and countries worldwide are vigorously pursuing regulations and subsidies to reduce carbon…
Science & Policy Briefs   -  Featured
6.16.2024

Effects of Net Zero by 2050 – Summary

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Effects of Net Zero by 2050 – Summary Physics Proves that Policies by the United States and Other Countries to Reduce CO2 Emissions to Net Zero by the Year 2050 and Eliminate Fossil Fuels Will Have A Trivial Effect on Temperature and Weather, But Disastrous Effects for the Average Citizen and Countries Worldwide We are…
Member Publications
6.5.2024

Measurement of CO2 Concentrations Through Time

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When recording historic levels of CO2 concentration, records from air bubbles in Antarctic ice cores are regarded as the gold standard for paleo-atmospheric global CO2 concentrations during past interglacial and glacial periods over the last 800,000 years.  Antarctic ice-core data are openly available from the National Centers for Environmental Information (NCEI) and have been studied…
Member Publications   -  Featured
6.6.2024

We Can Still Avoid the Net Zero Trap

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Radiative transport of energy in the atmosphere can be easily calculated using fundamental physics. These calculations confirm the observations that greenhouse gases play a modest role in climate warming. The important conclusion from theory and measurements is that there is no man-made climate crisis. However, climate models – constructed by governmental organizations – predict a…
Science & Policy Briefs
6.11.2024

Net Zero Averted Temperature Increase

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R. Lindzen, W. Happer, and W. A. van Wijngaarden June 2024 Many people are surprised by how little warming would be averted from adoption of net zero policies. For example, if the United States achieved net zero emissions of carbon dioxide by the year 2050, only a few hundredths of a degree Celsius of warming…
Member Publications
4.22.2024

Nutritive Value of Plants Growing in Enhanced CO2 Concentrations (eCO2)

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We are pleased to announce the publication of our latest research report Nutritive Value of Plants Growing in Enhanced CO2 Concentrations (eCO2). Despite many years of claims that increasing concentrations of CO2 are an “existential threat” to life on Earth, one cannot identify any harm that has been done. In fact, the only clear result…
Testimonies & Statements
4.15.2024

Fossil Fuels and Greenhouse Gases Climate Science

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Paper prepared by Richard Lindzen, William Happer, Steven Koonin and submitted April 16, 2024. Summary provided below and the entire paper can be accessed here: Lindzen Happer Koonin climate science 4-24. THERE WILL BE DISASTROUS CONSEQUENCES FOR THE POOR, PEOPLE WORLDWIDE, FUTURE GENERATIONS AND THE WEST IF FOSSIL FUELS, CO2 AND OTHER GHG EMISSIONS ARE…
Member Publications
3.29.2024

An Experiment in Ocean Acidification: Why Buffering Matters

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Click the link below to view/download the presentation slides (based on CO2 Coalition member Marty Cornell’s report)   Teaching Ocean Acidification   In this presentation, Dr. Sharon Camp addresses the widespread concern that the fossil fuel-driven increase in atmospheric CO2 is a detriment to our oceans and its marine life.  
Member Publications
3.24.2024

An open letter to the California Air Resources Board

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An open letter to the California Air Resources Board Download the entire body of the CO2 Coalition report here CO2C Letter to CARB Body March 22, 2024 Re: CO2 Coalition Evidence of NO Climate Crisis in California Dear Sir or Madam: Good news: There is NO climate crisis in California. This claim was verified by…

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