State of Our Climate
Atmospheric Greenhouse Gas Concentrations
Scripps daily CO2
CO2 equivalent
​Atmospheric GHG concentrations all together are expressed as CO2 equivalent. It tells us we are 'committed' (locked in) to a higher warming​ than at present. ​Radiative (hear) forcing is derived from CO2 eq.

Atmospheric CO2        Dec. 2023 422.46 ppm
​ice core limit​s
CO2: 300 ppm
methane: 800 ppb
nitrous oxide: 300 ppb​​
Dec. 2023
CO2: 422.48 ppm
methane: 1,920 ppb
nitrous oxide: 336 ppb
Pre-industrial levels
CO2: 278 ppm
methane: 722 ppb
nitrous oxide: 270 ppb​
CO2 equivalant 
(all GHGs​)

May 2023
​​​​523 ppm (CO2 eq.)
​​All three atmospheric GHGs are record high increasing at record rates, methane explosively
Past 800,000 yrs
Past 2,000 yrs
From 1800​
(seasonally adjusted mean)
Atmospheric methane.      April 2023   1920 ppb
Nitrous oxide                   March 2023   336 ppb
52% increase
266% increase
​Explosive increase since 2019
WMO annual GHG Bulletin

From Scripps CO2: record for past week and up to 800,000 years ago

The (accelerating) concentration of all atmospheric greenhouse gases combined (CO2 equivalent) constitute a full long term ​equilibrium warming of over 2.5°C (Constant composition commitment)

There will be additional warming from the many large planetary feedback sources​ (like wetlands and permafrost)- not included in IPCC projections.

​There will be additional warming due to reduced efficiency of the land (forest) and ocean carbon sinks that have had the effect of buffering the warming by about 50%. 

Another source of extra warming results from fossil fuel emission air pollution aerosol cooling, a hidden source of warming unmasked with termination of fossil fuel energy. Recent air quality measures have reduced ​the aerosols.