Climate Report for December 2023.
Today is Wednesday 20th December 2023. The Global Monitoring Laboratory of the US NOAA reports that atmospheric CO2 averaged 420.46 ppm in November of this year, compared to 417.47 ppm in November 2022, an increase of 2.99 ppm, or 0.716% p.a. The daily means for the past twelve days (inclusive of this one) can be found at NOAA , or here: for the 9th: 421.31 ppm; for the 10th: 421.56; the 11th: 421.66; the 12th: 421.99; the 13th: 421.78; the 14th: 421.8; the 15th: 423.38; the 16th: 423.21; the 17th: 422.67; the 18th: 422.38; the 19th: 422.03; and the 20th: 421.94. The average for those twelve days is 422.1425 ppm. The Keeling Curve's atmospheric CO2 level reading for yesterday, the 19th December, was 421.58 ppm. The difference of 0.45 ppm between that reading and the one provided by the NOAA can, perhaps, be accounted for if the two figures are translated into milligrammes per cubic metre (mg/m^3): 422.03 ppm = 817.8 mg/m^3; 421.58 ppm = 816.9 mg/m^3, a difference of just 0.9 mg/m