Soaring food prices around the world are putting greater hardship on the world's poor. But head to different parts of the world and you will find places where rising food prices are having a positive effect.

In Bolivia for example, the greater profitability of crops like rice and coffee has farmers at last making a switch the international community has long wanted - away from growing coca.

Leaders there say the change is causing a revolution in Bolivian agriculture.

Tom Ackerman has more.