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UNEP

The loss of calories by feeding the cereals to animals instead of using the cereals directly as human food represents the annual calorie need for more than 3.5 billion people.
Environmental food crisis

A synopsis of the report and link to the main study: Environmental food crisis

Quotes: 
The loss of calories by feeding the cereals to animals instead of using the cereals directly as human food represents the annual calorie need for more than 3.5 billion people.