I never ate meat during my whole life because of a gastric problem. But I still eat seafood (Fish, shrimp...). Some call this being pescetarian.
I always thought that this was also respectful of the environment. Recently a person told me that this was false, as fish production also has a big impact on the environment. Is that right? Don't I help even a little bit by not eating meat?
I would like a quantification of the differences of the environmental footprints between an omnivorous person, a pescetarian and a full-vegetarian.
If possible, I'm searching for quantifiable answers, for example : "meat consumes x times more energy per kilo than fish and y times more than cereals."
I have a partial answer from this question but it doesn't cover the case of pescetarians.