Greenhouse gas emissions flows

I recently had cause to remember and appreciate this 2008 graphic from the World Resources Institute (WRI).  Ordinarily, there is confusion between various statistics one reads about economic sectors (such as transportation, energy, agriculture), about economic activities and end uses (such as heating residential buildings, heating commercial buildings), and about gasses (such as carbon dioxide and methane).  The graphic still doesn't answer one of my questions -- I am trying to reconcile environmental accounts that (a) place food distribution with the corresponding manufacturing and distribution sectors or (b) attribute all of these costs to food itself.  Nonetheless, it is a good data visualization.