Offsetting the carbon cost of going from an all-chicken diet to an all-beef diet would cost $22 per year, or about 5 cents per beef-based meal. Since you would be saving 60 chickens, this is three chickens saved per dollar, or one chicken per thirty cents. A factory farmed chicken lives about thirty days, usually in extreme suffering. So if you value preventing one day of suffering by one chicken at one cent, this is a good deal.
See also