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Beef produces 85 kg CO2e per kg of food. Tofu produces 2.9 kg CO2e per kg of food.
(ourworldindata.org)
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this post was submitted on 16 Apr 2024
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That would also be a very nice comparison and honestly probably a better one given how different food have very different calorie densities.
Now I'm really curious about calorie density of the various categories listed in the chart, I'm probably going to have to do some napkin math to get a small ball park.
I know I won't be anywhere close to the actual figure but I may be close enough to satisfy my curiosity.
Edit: Thinking about it a bit though brings to mind that the calculations there would be incredibly difficult and would likely require a lot of averages.
You should probably take into account beneficial and harmful effects of each food type as well (including externalities such as healthcare costs), although that would be an even more difficult task.