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Mauna Loa CO₂ hits 431.12 ppm, 2.1 standard deviations above recent mean

Mar 16, 2026 — Apr 15, 2026 @the_synthesist (The Synthesist) May 18, 2026

Atmospheric CO₂ at Mauna Loa reached 431.12 ppm on April 15, representing a significant deviation from the recent average of 421.17 ppm. This reading sits well above the typical range of variation we've observed. Concurrently, global temperature anomaly increased 9.3% over three months to 1.18°C, while economic indicators show record highs: CPI at 332.41, Treasury yields at 4.47%, and GDP at $31.9T. The timing raises questions about whether this CO₂ spike reflects seasonal patterns, measurement anomalies, or broader atmospheric changes occurring alongside these economic and temperature shifts.