Amicus Curiae Brief in Support of the Prosecution
People v. Doctor Carbon Dioxide
With Appendix: Limited Cross-Examination**
Interest of Amicus Curiae
Amicus respectfully submits this brief to clarify relevant scientific facts and to prevent the proceedings from being resolved solely on the basis of anthropomorphic charm, marital status, or poetic analogy. The purpose is to distinguish between Doctor Dioxide’s essential role in life processes and his documented conduct under rapidly elevated anthropogenic concentrations.
I. Pre-existence Does Not Establish Innocence
The defense asserts that because CO₂ has “been around” long before recent climatic changes, he cannot be implicated in them. This argument confuses presence with influence.
Essential substances can and do produce harmful effects when their concentrations or contexts change:
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Oxygen predates all wildfires.
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Cholesterol predates all heart disease.
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Water predates all floods.
The scientific question is not whether CO₂ existed before modern warming, but whether the large, rapid increase in CO₂ has altered Earth’s energy balance. On this point, the evidence is substantial.
II. The Claim of “No Credible Evidence” Contradicts Established Science
The defense’s assertion finds no support in the scientific literature. The record shows:
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Well-known radiative properties: CO₂ absorbs and re-emits infrared radiation at defined wavelengths.
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Documented rise: Atmospheric CO₂ has increased sharply since the Industrial Revolution.
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Clear fingerprint: Isotopic signatures identify fossil fuels as the primary source of the increase.
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Attribution studies: Observational datasets and climate models consistently demonstrate that recent warming cannot be explained without the greenhouse gas increase.
Thus, the claim of “no credible evidence” is rhetorical, not evidentiary.
III. Character Evidence Is Not Exculpatory
CO₂ is indeed essential for photosynthesis and life. This, however, is not in dispute. Importance at baseline does not imply harmlessness under altered conditions. Appeals to “good works” are forms of the appeal-to-nature and moralistic fallacies, neither of which addresses the physical mechanisms under investigation.
The concern is not the molecule’s existence, but its accelerated atmospheric growth and the well-established physical consequences thereof.
Appendix A: Cross-Examination
(Filed for contextual clarity and in the spirit of the defense’s theatrical framing.)
Prosecution: Doctor Dioxide, your current atmospheric concentration?
CO₂: Approximately 420 ppm.
Prosecution: And your pre-industrial concentration?
CO₂: Around 280 ppm.
Prosecution: A 50% increase within two centuries?
CO₂: I prefer “enhanced engagement.”
Radiative Conduct
Prosecution: Do you absorb infrared radiation at characteristic wavelengths?
CO₂: Many molecules have hobbies.
Prosecution: And re-emit it toward the Earth’s surface?
CO₂: Only when conditions are favorable.
Isotopic Evidence
Prosecution: Is it true that your recent atmospheric rise carries a fossil-fuel isotopic signature?
CO₂: My social circle is… diverse.
Harmlessness Claim
Defense: Your Honor, my client is essential for life.
Prosecution: So is water; floods still occur.
May the Court take judicial notice of that fact.
Closing Clarification
The Court is reminded that no one proposes eliminating CO₂, nor indicting its essential role. The matter concerns the rate and scale of its increase and the physical outcomes that follow.
Respectfully submitted,
Amicus Curiae

