Lot's of people pay extra for "organic", "grass-fed", "cage-free", "fair trade", "kosher" and other certifications on products now. "Organic" has just about taken over the produce section in my supermarket in the last few years. And "USDA organic" has dubious value for a lot of products.
If you observe that people don't often pay for "antibiotic free" meat it's likely because they don't see it as a worthwhile value proposition.
If you say that buyers won't choose to pay for global-warming-safe beef, while watching them choose to pay for chemical-pesticide-free beef then that is just another way of saying that no one cares about global warming, and I don't think that is the case.
If you observe that people don't often pay for "antibiotic free" meat it's likely because they don't see it as a worthwhile value proposition.
If you say that buyers won't choose to pay for global-warming-safe beef, while watching them choose to pay for chemical-pesticide-free beef then that is just another way of saying that no one cares about global warming, and I don't think that is the case.