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An Oxford University study, widely reported, has concluded that if all the meat eaters in the UK cut down their ingestion of meat it would be the equivalent of taking 8 million cars off the road.
A big meat-eater's diet produces an average of 10 kg of planet-warming greenhouse gases each day. Meat industry spokespeople refute these figures.
Dr Ali Hill joins us from Otago University's Department of Human Nutrition.
