Greenhouse gas emissions from Agriculture has been well known for quite a while, though not as long as Fossil Fuels.
From this very article you can see it's the United Arab Emirates pushing hard for the Agriculture-angle on their COP - it's almost as if they have a vested in interest in moving the focus away from Fossil Fuels.
One has to wonder just how many years' worth of cow farts add up to the same greenhouse effect (over the long term, as methane is a stronger greenhouse gas but has a far lower half-life in the athmosphere than CO2) as more than 100k people flying over to COP28 (kudos to the genuine Environmentalists, who went by boat) or just a couple of hours of private-jet flight emissions.
Then there are all the moralists who are trying to use Climate Change as an angle to push their morals on others when it comes to using animals as food: the very same people who are usually (in my personal experience) unwilling to forego having a car or two and driving rather than cycling (from my observation, their "environmentalism" stops at chosing an electric car, which still polutes - micro-particles from tires, electricity generation emissions, manufacturing and end-of-life emissions - a lot more that my own personal choice of more than a decade of selling my car and walking and cycling instead) will blow out of all proportion the propagandist messaging put out by fossil-fuel fatcats and elites protecting their priviledge, distorting the reality and proportion of what is a genuine concern, because it helps force their own morals on others.
Changes in Agricultural practies - including reduction of meat consumptiom at the consumer level - are indeed things that need to be looked at, all of which is hard to do seriously and in a proper and proportionate way due to the subversion around the subject from an unholly alliance of people with a self-interest in pushing this angle: moralists, elites who want to keep their priviledges and fossil-fuel fatcats keep poluting the subject and destroying any chance at a serious, well-ballanced and proportionate approach at reballancing Agricultural emissions, because none of those actors have a genuine environmentalist objective.