How do you keep food cold?

Up to 40% of food in Africa and India is wasted because of a lack of what's called "the cold chain" - the infrastructure keeping food chilled and fresh, from farm to fork.

Many small-scale farmers have no access to any kind of refrigeration, meaning they're losing income and wasting food that could otherwise be sold.

Devina Gupta meets the entrepreneur who is building pay-as-you-go solar powered cold rooms in India, and hears from farmers, traders and experts on how we can keep food cold as the population grows and the planet warms up.

(Picture: A farmer carries a crate of mangoes from an orchard on the outskirts of Bangalore. Credit: Getty Images)

Presenter: Devina Gupta Producer: Lexy O'Connor