And pretty common for a clean bulk unless you only weigh 150 pounds or so. If you're in the 200-225 pound range you're probably eating 250-300g of protein a day, which if it's only chicken breast will be approaching 3 pounds daily.

To be clear, this is for traditional bulking. And you only really do that if you're trying to get bigger weightlifting numbers for the sake of getting bigger weightlifting numbers. Nobody casually gets a 450 lb backsquat, they do this kind of stuff to get there.

That's the food intake of what, 4 or 5 'regular' people?

And probably 25 in the poor part of the world. I'm not a vegetarian but I wonder if the people that do this sort of thing realize the impact of what they are doing, it's the equivalent of consuming 1000+ chickens on an annual basis and that's not all they eat. I get it that kids in their teenage years eat a lot because they grow so fast and really need it but this feels excessive to me.

Damn near every hobby imaginable will have externalities. Asking as gently as I can: Maybe this isn't a battle to pick?

Tangentally, some clever children, when told to "Think of the starving kids in Africa. Finish your plate" will retort with "Then give me a stamp". Someone who's hobby is improving their squat or deadlift, and picking up lots of chicken at the store, is not (intuitively to me, at least) taking food off the plate of someone with less - especially those >3 timezones away. That's a distribution problem, not a lack-of-food-worldwide problem

In order to truly optimize for environmental concerns, you really should be eating nothing at all.