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AGENCE FRANCE-PRESSE/GETTY IMAGES PHOTOGRAPHS Visitors (above) walk along the bridge linking the Expo Zaragoza 2008 with the town center in Zaragoza, Spain, on June 14. The water-themed expo showcases water and sustainable development. An exhibit (top left) brings attention to water scarcity and climatologists' predictions that climate change will intensify shortages. The message behind the expo (top center) is that Europe's water supply is being threatened. The inside of the Spanish pavilion is seen at top right. A plant near Zaragoza is recycling wastewater for industrial and agricultural uses.