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For the most part, not only does vegansim have the biggest positive impact on the environment that can be made with a personal choice, the animal products industries are like the third biggest contributor to climate change after energy (coal, oil, gas, etc) and manufacturing. Plus, as most farm land in the world is used for animal feed, it would free up land for reforestation.
P.s When talking about GHG emissions, it's a really bad idea to use % of total emissions as an indicator of impact. Livestock produce plenty of methane, which is roughly 84 times more impactful than carbon dioxide on the short term (20ish years) but carbon dioxide is more impactful over the long term (centuries) as it does not break down as quickly.
there simply isn't any reliable data to support this claim.
There is:
https://www.wri.org/insights/climate-impact-behavior-shifts
Other than going car free (not possible in many countries where roads are just not bikable or walkable) not flying (yeah, you probably shouldn't and personally I rarely ever do) and switching your home to green energy (again, not really possible in some countries plus high up fron costs keep it impossible for many) the biggest impact is achieved through veganism.
Having fewer children is the biggest https://iopscience.iop.org/article/10.1088/1748-9326/aa7541
Yeah, I guess that makes sense even without needing a source