One billion. That's the number of hungry people worldwide. The effects are heartbreaking. Solutions are needed now to feed future generations.

In this series, the UN 's three food agencies – FAO, WFP and IFAD – take us around the globe in search of answers to some of the most pressing questions we face today.

In this episode of Hungry Planet, the video crew visits Rwanda, where tea fields are helping to rebuild a country. In the second clip, WFP staff shops in the markets of Cambodia, Pakistan and Egypt to see how much (or little) food a dollar will buy. In the final clip, the crew goes to Sri Lanka where cattle here were among the last in the world to undergo blood testing under FAO's Global Rinderpest Eradication Programme.