Guest post by Jim
NOAA has once again released its monthly updates to CO2, CH4, and N2O. See the data section for each gas.
Here are the updated results. Little has changed. By 2030 the atmosphere will have such a high concentration of greenhouse gases that the effective radiative forcing will be twice that of the pre-industrial era.
The 2x crossing is now estimated to occur 1 April, 2030 (no joke!), give or take a month; changes in this estimate over the last year are more likely due to month-to-month fluctuations, not long term changes in trends.
Here is the combination of historic data, satellite era data, and the most recent updates from NOAA:
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