@Salemblackcat
The George Monbiot article isn’t a peer reviewed scientific study. It doesn’t mention methane or co2 just land use. Even if the information in the article is right (and without seeing the studies it’s based on it’s impossible to say) if animal agriculture produces about 10% of the world's emissions it’s still awful! Veganism is still better even by this article’s standard! He’s just saying it’s not as much better as he thought.
Peer reviewed studies:
“Today, and probably into the future, dietary change can deliver environmental benefits on a scale not achievable by producers. Moving from current diets to a diet that excludes animal products (table S13) (35) has transformative potential, reducing food’s land use by 3.1 (2.8-3.3) billion hectares (a 76% reduction), including a 19% reduction in arable land; food’s GHG emissions by 6.6 (5.5-7.4) billion metric tons of CO2eq (a 49% reduction); acidification by 50% (45-54%); eutrophication by 49% (37-56%); and scarcity-weighted freshwater withdrawals by 19% (−5 to 32%) for a 2010 reference year.“
josephpoore.com/Science%20360%206392%20987%20-%20Accepted%20Manuscript.pdf
“Meat sector is one of the leading polluters in the food industry. Regardless of the perspective, environmental impacts of the meat chain influence three dimensions — climate change in respect to the global warming potential, acidification potential and eutrophication potential; consumption of natural resources (mainly water and energy) and; polluting the environment with various types of waste and waste water discharge.”
www.sciencedirect.com/science/article/pii/S2211601X15001157
www.fao.org/docrep/010/a0701e/a0701e00.HTM
The meat sector is one of the food sectors with global environmental impacts. Regardless of the type of meat produced and technology applied, similar actors in the food chain exist and similar environmental impacts occur. This type of production influences climate change in respect to global warming, acidification and eutrophication potentials and ozone depletion substances and has a high ratio of consumption of water and energy resulting in waste and waste water discharge. Regardless of differences in meat technology, eating habits and cultural diversity, environmentally sound production is one of the greatest meat chain challenges in 21st century.“
iopscience.iop.org/article/10.1088/1755-1315/85/1/012015/pdf