I have seen several lists with CO2 emissions by weight for producing several different food products. I think this is an interesting consideration, and possible argument for vegetarianism/veganism.
I would however prefer a list with CO2 emissions by calorie, as I feel it is a more useful at estimating consumption. Further more the above lists unfairly disadvantage calorie dense foods, or foods with low water content. I haven't been able to find a detailed list (e.g. this is to coarse for my purposes, but otherwise good), so does anyone know of such a list?
Preferably the list should be location neutral (i.e. if transportation CO2 cost is taken into account it should be general enough to apply for all areas)