Latest results from the global #methane budget project is out. Key insights:

1) Fossil fuel, agriculture, & wetlands responsible for ~20%, 40%, and 30% of emissions.
2) Recent increase in atmospheric levels equally from fossil & agricultural sources. https://iopscience.iop.org/article/10.1088/1748-9326/ab9ed2">https://iopscience.iop.org/article/1...

Increases in #methane emissions across sectors vary by region:

Big https://abs.twimg.com/emoji/v2/... draggable="false" alt="⬆️" title="Pfeil nach oben" aria-label="Emoji: Pfeil nach oben">in fossil #methane: US/North Am., China, and Africa/Middle East (lesser extent).
Big https://abs.twimg.com/emoji/v2/... draggable="false" alt="⬆️" title="Pfeil nach oben" aria-label="Emoji: Pfeil nach oben">in agriculture: Africa/ME, India/SE Asia

Q: Did global #methane from biomass burning really decrease in 2017?

Caveat: A recent study that used ice core data to independently analyze atmospheric methane showed contribution from fossil fuels to be ~177 Tg CH4/yr between 2003 & 2012.

This is ~60% lower than the estimates by the global methane project. https://www.nature.com/articles/s41586-020-1991-8">https://www.nature.com/articles/...

In parallel, there is also evidence that at least US O&G methane emissions are underestimated by ~60%.

Is this just a coincidence or an indication that the global methane budget is under-estimating #methane emissions from fossil fuels?

I& #39;m not sure yet. https://science.sciencemag.org/content/361/6398/186">https://science.sciencemag.org/content/3...