Sonesson notes that the majority of uneatenfood in places like Sub-Saharan Africa is created at the point of production, largely as a consequence of things like spoiled crops or poor refrigeration.
Before making the switch, PricewaterhouseCoopers encouraged its employees to follow some basic rules of etiquette, reminding them, for instance, not to leave uneatenfood in someone else's office and urging them to replace office supplies they used.