An article on the BBC's Radio 4 site by Tom Heap suggests that ‘good' food alternatives such as organic or vegetarian could have a bigger environmental impact that having a diet of pork and chicken:

Peter Bradnock of the British Poultry Council says: “Organic poultry meat has about 45% more global warming potential than indoor-reared poultry meat. “If you're rearing outside, then the bird is using a little more of its feed to keep itself warm, or simply to keep itself cool in hot climates.”.

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