I once saw a girl at a March for Science protest with a sign that read "you can't be an environmentalist and still eat meat." This immediately made me angry, as such a statement obviously comes from a place of privilege, ignorance, and an obvious misunderstanding of agriculture's contribution to climate change. While industrial agriculture is the main culprit for massive carbon emissions, raising livestock does create require more resources and creates more emissions than aquaculture and produce. But is it reasonable to ask people to consume less meat and choose a more plant-based diet for the sake of the climate?
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Meat has been a part of human diets since time immemorial, and we are omnivores as well. This is not changing anytime soon, and it would even be unnatural for people to not consume any meat. However, it does not mean that people need to eat meat every single day (as is often the case in many Global North countries). It would be unwise to say that it is possible to consume and produce meat at the current rate, and it will only help the climate to reduce meat consumption drastically. But eating meat occasionally does not mean that you are an enemy of the Earth.
That being said, it is reasonable to ask people to consume less. The entire emission issue is not a result of consumption, but over consumption. If we want to remain within planetary boundaries and make sure no one starves, it is important that people transition to a plant based diet.
However, it is also important to note that it is not possible for everyone to transition to a plant based diet simply because crops can't really grow in the climate they live in, such as the Saharan regions or Tibet. We shouldn't vilify anyone, and especially not people who don't have much of a choice in their diets.