A recent MSc thesis finds that growing your own food has a higher Global Warming Potential (GWP) than outdoor production but lower than covered production. Fuel use was the highest contribution - improvements could mainly come from allotment holders cycling to the allotment rather than driving.
Carter C. (2010). Global Warming Potential of produce grown on an allotment using a life cycle assessment approach Case Study: Wellesbourne Allotment, Msc Thesis, University of Surrey, 2010
h/t FCRN
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