If we were all vegan we could remove the crops grown to feed animals, the methane emitted from ruminating livestock and distribution of meats. This would have a significant effect on the overall footprint of our meals. However, I doubt this would be a way we could stop global warming. More likely reducing our oil consumption and transitioning to more renewable energy could have this effect.
Switching to an all vegan diet would have a minor impact on global methane emissions, as there would be a drastic reduction in cattle farming for beef and dairy products. Cattle currently contribute about 28% of all human related methane emissions, which is less than 2% of all green house gas emissions. The industrial process related to cattle and other livestock farming operations would also cease, and would be beneficial to further reducing the emissions of greenhouse gasses.
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