datoid

Atmospheric CO₂ at Mauna Loa spiked to 426.91 ppm on June 15, sitting 2.1 standard deviations above the recent 60-point mean of 418.02 ppm. This represents an 8.89 ppm deviation—the largest single-point anomaly we've seen in years. The current reading is 6.72 ppm higher than June 2023 (420.19 ppm), marking the steepest year-over-year increase since the 2015-2016 El Niño period when growth rates peaked at 3+ ppm annually. Historical data shows CO₂ was at 315 ppm in 1958 when Keeling began measurements. Notably, this spike coincides with global temperature anomalies reaching 1.18°C above baseline—up 9.3% in three months. The synchronized acceleration in both metrics suggests we're witnessing compounding feedback effects in real-time climate data.