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This is a decent, well-cited article on the subject: https://ourworldindata.org/food-choice-vs-eating-local

It summarises the differences in global greenhouse emissions between various types of food, and the contributions of the different sources of these emissions - farming, transport, land use change, and so on.

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Even without going into the details, I can already see a major mistake that is made here.

They cite emissions per kilogram, but that’s completely nonsensical. A kilo of meat does not equal a kilo of spinach in terms of calories or macro-/micro-nutrients.

This is a mistake that I see very often when these kinds of comparisons are made.

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