This is an interesting paper that emphasises the importance of including  land use change-related emissions in carbon footprinting.  Two of the authors (Christel Cederberg and Roland Clift) are FCRN mailing list members. Reference and abstract as follows: Cederberg C, Persson U M, Neovius K, Molander S and Clift R (2011). Including Carbon Emissions from Deforestation in the Carbon Footprint of Brazilian Beef, Environmental Science and Technology.  

Abstract

Effects of land use changes are starting to be included in estimates of life-cycle greenhouse gas (GHG) emissions, so called carbon footprints (CFs), from food production. Their omission can lead to serious underestimates, particularly for meat. Here we estimate emissions from the conversion of forest to pasture in the Legal Amazon Region (LAR) of Brazil and present a model to distribute the emissions from deforestation over products and time subsequent to the land use change. Expansion of cattle ranching for beef production is a major cause of deforestation in the LAR. The carbon footprint of beef produced on newly deforested land is estimated at more than 700 kgCO2-equivalents per kg carcass weight if direct land use emissions are annualized over 20 years. This is orders of magnitude larger than the figure for beef production on established pasture on non-deforested land. While Brazilian beef exports have originated mainly from areas outside the LAR, i.e. from regions not subject to recent deforestation, we argue that increased production for export has been the key driver of the pasture expansion and deforestation in the LAR during the past decade and this should be reflected in the carbon footprint attributed to beef exports. We conclude that carbon footprint standards must include the more extended effects of land use changes to avoid giving misleading information to policy makers, retailers, and consumers.