Nearly a third of all food produced in the world – more than 1.3bn tonnes – is lost or wasted every year.

The amount of food waste adds up to a global cost of $2 trillion and could feed as many as two billion people annually.

When walking along the colourful rows of Rio de Janeiro’s food markets, wilted cabbage leaves, bruised tangerines and discarded fruit cover the ground hidden behind the stalls.

“More than

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