The average CO₂ concentration in the atmosphere at Mauna Loa in October was ~426.7 ppm (estimate from daily values). That's ~1.7-1.8 ppm higher than last year; a modest increase compared with the ~2.5 ppm/year average growth over the past decade. El Niño still to kick in, though. The average CO₂ concentration in the atmosphere at Mauna Loa in October was ~426.7 ppm (estimate from daily values). That's ~1.7-1.8 ppm higher than last year; a modest increase compared with the ~2.5 ppm/year average growth over the past decade. El Niño still to kick in, though. #ClimateChange #CO2 #emissions