The problem is that carbon trading will mean that companies will soon be able to claim "green meat" is better, despite the fact they are often replacing old growth forrest with new growth "carbon" plantations especially designed to give a certain level of carbon credit per square kilometer. They can also claim green bio-fuel in the same way, replacing the massively absorbing old growth, with new growth bio-crops (which aren't then used to feed anyone and cost more for the CO2 cycle then normal crops). Eyes on the new Kyoto agreement if this changes so that old growth gets some worth in credit, if not then we can say goodbye to any chance of seeing truly "green" meat.