It’s not just the credit crisis that has been keeping policymakers awake at night. A food crisis is sweeping the world like “a silent tsunami”, as Josette Sheeran of the World Food programme puts it, leaving widespread riots and rattled governments in its wake.

When the leader of the United Nation’s World Food Programme warned that a “silent tsunami” of hunger is sweeping the globe because of soaring food prices, a lot of folks probably viewed it as just another clever sound bite tossed off by a bureaucrat.