Latest Updates
- Why Germany Is Building an Ark for U.S. Climate Data
German research institutions have begun copying United States climate datasets into German repositories, led by the German Climate Computing Center…
- A Research Strategy for Ocean-Based Carbon Dioxide Removal and Sequestration
WASHINGTON and Woods Hole, Mass. (Sept. 17, 2026)— Marine carbon dioxide removal (CDR) has advanced significantly, with growing research activity,…
- CO/2 Reduction Newsletter — Week Ending September 12, 2026
Original newsletter by Bob Haar Shared with ICS by Raymond Johnson The following is Bob Haar's weekly CO/2 Reduction Newsletter,…
- CO/2 Reduction Newsletter — Week Ending September 5, 2026
Original newsletter by Bob Haar Shared with ICS by Raymond Johnson The following is Bob Haar’s weekly CO/2 Reduction Newsletter,…
Climate Data
Mauna Loa monthly mean
427.55 ppm CO2
August 2026
Monthly means, 2021–2026 · 413.3 to 432.3 ppm +2.07 ppm in a year — August 2025 was 425.48 ppm
Global surface temperature, vs the 1951–1980 average
+1.40 °C
August 2026
Annual means, 1970–2025 · -0.10 to +1.29 °C August 2025: +1.18 °C · 2025 annual mean: +1.19 °C
Arctic sea ice extent
4.87 million km2
22 September 2026
2026 so far (dark) against the 1981–2010 daily mean (grey) 1981–2010 mean for this date: 6.39 (−24%, 28 years)
Each reading is taken from the agency that publishes it, on the date shown. Comparisons are calculated from the same published files.