People ride horse-drawn carts loaded with firewood as they cross the Danube river, made possible by an ongoing drought which has caused a drop in water levels, in Calarasi, southern Romania, on Dec. 11, 2011. The waters of the mighty Danube are so low that dozens of cargo ships are stuck, stranded in ghostly fog or wedged into sand banks on what is normally one of eastern Europe's busiest transport routes.