I am a poultry Breeder. The hens that lay white eggs (Amberline/White Star) DO NOT have a lower carbon footprint.The comments made in the second linked post certainly support the disdain from the poultry farmer in question.
Yes they eat a bit less and produce roughly the same amount of eggs as the Brown egg layers (Bovan/Lowman/ISA Brown) but they live shorter lives, are prone to dying suddenly when startled, a flighty and nervous and because they live shorter productive lives (12 -18mnths) vs brown 18/24mnths (both commercial farmed), you have to incubate more which is increased (Electricity/gas costs) and their eggs are not the same quality.
I breed and keep 20+ different breeds, including: ISA Brown hens and White Stars. All my hens are 100% free range, Not a single barn kept bird, I have ISA browns that are 5yrs old and still laying beautiful Brown eggs, I have not seen a White star live beyond 3yrs and certainly none have laid eggs past 18-24mnths.
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You want to know about eggs, come talk to someone like me, Don’t rely on some hairbrained imagination of a buyer who’s trying to squeeze the profit margin for a few extra pennies at our expense and to the poor hens detriment.
And the climate cultist BS continues.