Originally published on

by at Arctic News

Carbon dioxide (CO₂) reached an average daily concentration of 422.06 ppm on April 26, 2022, at Mauna Loa, Hawaii.

Furthermore, very high methane levels were recorded recently at Mauna Loa, Hawaii, with surface flask readings appearing to be as high as 1955 ppb.  

This daily average CO₂ concentration of 422.06 ppm together with a methane level of 1955 ppb (which at a GWP of 200 corresponds with 391 ppm CO₂e), adds up to a joint CO₂e of 813.06 ppm, i.e. less than 387 ppm away from the clouds tipping point that on its own could raise the global temperature by 8°C.

Such a 387 ppm CO₂e could be added almost immediately by a burst of seafloor methane less than the size of the methane that is currently in the atmosphere (about 5 Gt). There is plenty of potential for such an abrupt release, given the rising ocean heat and the vast amounts of methane present in vulnerable sediments at the seafloor of the Arctic Ocean, as discussed in posts such as this one.

[ images and joint CO₂e earlier discussed at this post, click on images to enlarge ]

The 1200 ppm CO₂e clouds tipping point could be crossed even without such an abrupt methane release. Carbon dioxide and methane levels are rising rapidly. The above combination image illustrates how, by the year 2029, carbon dioxide could reach 450 ppm and methane could reach 3840 ppb, which would yield a joint CO₂e of 1218 ppm and thus raise the global temperature by 8°C due to the clouds feedback alone, in addition to the rise caused by nitrous oxide and the many further forcers, as discussed at the Extinction page

The situation is dire and calls for comprehensive and effective action, as described in the Climate Plan.


• NOAA – Global Monitoring Laboratory, Recent Daily Average CO₂ at Mauna Loa, Hawaii, U.S. 

• NOAA – Global Monitoring Laboratory, Methane (surface flasks) at Mauna Loa, Hawaii, U.S. 

• The Importance of Methane

• Clouds feedback