In his March 13 letter, https://losalamosreporter.com/2026/03/13/the-war-on-our-middle-class-our-countys-climate-action-plan-is-topic-of-townhall-meeting-set-for-march-19/, David Reagor explains “When the concentration of Carbon Dioxide reaches current values absorption in the infrared spectrum has saturated, and additional Carbon Dioxide has little energy to absorb.”

While Mr. Reagor makes some salient points in his letter, the above statement is misleading at best*. While the rate of temperature rise declines as more CO2 is added, the effect does not become trivial. This is best understood by considering his next sentence.

“As the concentration increases past current values only a small linewidth effect remains, and the change is (sic) total heat budget will only be parts per thousand.”

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