Food processing, packaging, transport, household consumption and waste disposal are pushing the food supply chain to the top of the greenhouse gas emitters list, according to a  new study led by the UN agriculture agency, presented on Monday at the COP26 climate conference in Glasgow. In its analysis, the Food and Agriculture Organization (FAO) maintains that the food supply chain in many countries is on course to overtake farming and land use as the largest contributor to greenhouse gases (GHGs) from the agri-food system.