The Middle East and North Africa region loses about $21 billion each year because of an inadequate supply of water and sanitation, the World Bank said Tuesday, warning that urgent action is needed to prevent ripple effects on stability and growth. Poor management of water resources and sanitation in the world’s most water-scarce region costs about 1 percent of its annual gross domestic product, with conflict-hit states losing as much as 2 to 4 percent each year, the bank said in a report issued at the World Water Week conference …