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Animal feed Here we are not talking about grass or pasture. We are talking about plant matter that is digestible by humans but is instead fed to animals. Globally, there is enough of this to provide about 1800 calories per day to every person on the planet; that's about three quarters of the global food requirement for human energy. In return, animals give us back about 10% in the form of meat and dairy products. Cutting out animal feed would hugely help us feed the world and preserve biodiversity.