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“Come round for dinner! I’ve got some lovely fresh algae.” Tempted? Perhaps not, but roll forward 50 years and micro-algae might well feature on the menu. Maybe not directly, but they could become a common base for cooking oils, and a major constituent of animal feeds. Cultivating algae for food and biofuel could make a serious dent in our greenhouse gas emissions, as well as helping to save freshwater resources and reduce deforestation.