On the methane increase since 2007, I remember reading about a NASA study that had pinned this increase on the fracking boom which got going round about that time:
'“the team showed that about 17 teragrams per year of the increase is due to fossil fuels, another 12 is from wetlands or rice farming, while fires are decreasing by about 4 teragrams per year,” NASA said in a January 2 press release. “The three numbers combine to 25 teragrams a year — the same as the observed increase.” [...] “The sharp increase in methane emissions correlates closely with the U.S. fracking boom,” said Jim Warren, executive director of the climate watchdog group NC WARN. “Leaking and venting of unburned gas — which is mostly methane — makes natural gas even worse for the climate than coal.” - https://www.desmog.com/2018/01/16/nasa-study-resolves-climate-mystery-confirms-methane-spike-ties-oil-gas/
Though undoubtedly the livestock industry also increased in size during that time (the article doesn't mention livestock as part of the calculation for some reason).
I do keep the Sinclair quote in mind and try to account for work-based bias when considering these topics fwiw. I'm back in veg growing now anyway, so am free to think what I like about livestock You do get a different kind of knowledge about these things from having done them firsthand though, I've found. Nothing's as cut-and-dried as it might seem at first glance... But yeah, confirmation bias is definitely something to guard against, and seductive as in any other line of employment.