Green Marketing Manifesto author John Grant responds to our post about whether organic and vegan food is environmental. He says:

It’s a bit of an odd statement – what is ‘global warming potential’?… That is nothing to do with the central issues of animal welfare, use of antibiotics and feed additives such as arsenic. Carbon here is a side issue. There are 850 million chicken raised in britain a year; an average of about 14 per person per year. So on average the difference is just under 30kg of carbon dioxide vs your 11 tonne annual footprint.

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