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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)
Discussion of climate, how it is changing, activism around that, the politics, and the energy systems change we need in order to stabilize things.
As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades:
How much each change to the atmosphere has warmed the world:
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I think GP is suggesting that, for a better picture, you also need to include stuff like the CO2 emissions from the vitamins you'll need to eat to balance the nutritional deficit. Given how bad meat is for the environment, it wouldn't surprise me that the total balance is still way worse for meat.
Somehow I feel the need to clarify I'm not shilling for beef, but extra vitamins is something that my vegetarian SO constantly has to be keep in mind.