Fair question. Here are all the greenhouse gases with historical concentrations and projected out until 2500. https://gmd.copernicus.org/articles/13/3571/2020/
Methane Growth is Accelerating
In my latest YouTube video I discuss the NOAA numbers showing global methane now over 1900 ppb as of September, 2021. I then present my own personal hack of the NOAA data that measures annualized global methane growth. My hack takes into account the relatively fast rate of decay for methane (half-life of 110 months), which leads to stunning and catastrophic conclusions about what’s going on with methane. Hint. At this moment, the COP-26 methane promise (reduction of 30% of global methane by 2030) seems like endless rainbows, unicorns and fairies.
The point with methane is that because its short half-life is competing with accelerating non-anthropogenic sources (equatorial wetlands, ESAS methane hydrates, Siberian permafrost, etc.), methane will either tip towards exponential decay or continue its massive growth. Methane is the gas that will determine how quickly the climate changes in the near-term. At present, all signs point North.
Really appreciate the explanation of the data and the graph. How many people use the publically available data to inform the public?
Dr. Jacobson,
Can I get a copy of your Methane chart in the article to share with others