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Animal agriculture has been identified as playing a large role in climate change. I am interested in how much of a difference someone can make through diet changes.

How much is the average North American's greenhouse gas footprint reduced by eating vegetarian? What about vegan?

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See this article: The carbon footprint of 5 diets compared - shrinkthatfootprint.com

It suggests that the average person produces 2.5 CO2e a year while a vegetarian only produces 1.7 CO2e a year, and vegans produce 1.5 CO2e a year.

Apparently, 18% of global carbon emissions come from livestock

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