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Food accounts for a third of all greenhouse gas emmisions, so making informed decisions about what we eat is more important than ever. In this Horizon special, Gregg Wallace and mathematician Dr Hanna Fry take over a restaurant and invite five guests to a dinner party with a difference - the diners will be scored on the environmental impact of the dishes they order. Sarah Pascoe, Amol Rajan, Nikki Fox, Desiree Burch and Matthew Fort, attempt to choose wisely from a menu of tantalising treats.