http://www.eurotrib.com/story/2006/12/18/105222/30#8
Europe agriculture is so oil-intensive (fertilizer and industrial diary) that's it's better CO2 wise to transport meat from australia to UK than to produce locally.
I don't know about vegetables though, but I assume indoor growning eats some oil too.
Proponent of local production show zero reasonable argument so far. Purely emotional campaign.
Livestock's Long Shadow, LEAD http://www.virtualcentre.org/en/library/key_pub/longshad/A0701E00.pdf
One Planet Agriculture, Soil Association http://transitionculture.org/wp-content/uploads/2007/thecaseforaction.pdf
Food Miles, DEFA http://statistics.defra.gov.uk/esg/reports/foodmiles/default.asp
