According to a survey from the Waste and Resources Action Programme, Britons throw out a third of all food purchased, about 6.7m tons of food a year: "Wrap figures suggest that around 20% of British climate change emissions are related to the production, processing, transportation and storage of food. The main reasons for having excess food were that more was bought than needed, that fridges were too warm and that many products with a short shelf life were not eaten prior to their best before date. Children refusing to eat food or pestering their parents to buy unwanted items while shopping further contributed to waste, Wrap said, along with informal or unplanned eating patterns." Appalling, but I can't imagine things are much better in the rest of the developed world—anyone know where I can find statistics?

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