Our food system is responsible for up to 80 percent of the world's biodiversity loss and one third of all CO2 emissions. At the same time, 800 million people are undernourished and 2 billion overweight. In 10 Billion Mouths, Professor Katherine Richardson asks one question to Danish entrepreneurs, Dutch researchers, Costa Rican officials, and Nigerian farmers: how do we feed 10 billion mouths without destroying the planet?