The Technical Summary of the IPCC AR6 Physical Science Basis report discusses "Atmospheric concentration of methane: The SRCCL reported a resumption of atmospheric CH4 concentration growth since 2007. The AR6 reports a faster growth over 2014–2019 and assesses growth since 2007 to be largely driven by emissions from the fossil fuels and agriculture (dominated by livestock) sectors. (Section TS.2.2)". (p.42)

" In the 1990s, CH4 concentrations plateaued, but started to increase again around 2007 at an average rate of 7.6 ± 2.7 ppb yr–1 (2010–2019; high confidence). There is high confidence that this recent growth is largely driven by emissions from fossil fuel exploitation, livestock, and waste, with ENSO driving multi-annual variability of wetland and biomass burning emissions.
In 2019, ERF from CH4 was 0.54 Wm–2. {2.2.3, 5.2.2, 7.3}" (p.69)

Incidentally, the recent Summary of the Synthesis Report, (The Longer Report) the IPCC list "efficient livestock management" as both a mitigation and an adaptation option. (p.78).

I've only checked Working Group I (Science) The Technical report, and the Synthesis Report summary. I'll let you have the pleasure of checking the full Physical Science Report as well as the Mitigation and Adaptation reports.

We shouldn't be making assumptions when there is so much science around.

I'm tempted to toss in that much used Upton Sinclair quote with an adaptation but I'm way too busy and probably just too nice to do such a thing

Incidentally, the IPCC is a very conservative body. They don't want to frighten us! James Hansen had a recent paper of his turned down by them.