An international exposition promoting water and sustainable development is underway in Spain.

The last expo, in 2005, held in the Japanese city of Aichi, also focused on the environment. And before that, here in Germany, Expo2000 in Hannover tried to dazzle us with answers to the technological challenges of the future. Not a lot has been heard about either of those Expos since, but this one in Zaragoza has promised not to be forgotten. It’s called The Water Tribunal and over the next three months, the Expo is committed to finding solutions to the world’s water problems. Danny Wood paid the Expo a visit.