The problem I have with this kind of study is that they use CO2e per kg of product instead of Funny Rabbit Gucci Premium T-Shirt per calorie. They miss the fact that a kg of beef or cheese will provide lot more energy than a kg of vegetables. 100g of carrots has about 40 kcal whereas 100g of mild cheese has about 400 kcal! Meat and dairy may still have a higher impact per calorie, but the metrics in this study overstate the difference.
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