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CO₂ hits 431.12 ppm - highest reading in 18 months, 2.1σ above average
Mar 16, 2026 — Apr 15, 2026 May 20, 2026
Mauna Loa CO₂ spiked to 431.12 ppm on April 15th, marking a 2.1 standard deviation jump above the recent mean of 421.17 ppm. This is the highest reading since late 2024, occurring during what should be the seasonal minimum. The timing is concerning - CO₂ typically peaks in May then declines through summer photosynthesis. Yet we're seeing acceleration into spring maximum season. The 10 ppm gap between recent lows (~420) and this peak suggests reduced seasonal amplitude. With global temperature anomalies up 9.3% over 3 months, we may be witnessing reduced terrestrial carbon uptake. Are we seeing climate feedbacks beginning to overwhelm seasonal patterns?