Simon Cook, Challenge programme on water and food talks on how water crises affect development. He considers four major nested crises which inlcude water scarcity, vulnerability with related to hazards, lack of sharing of information, resources and distribution of benefits and water productivity . These problems can only be solved through multidisciplinary or transdisciplinar approach, and Tropentag contributes importantly to the existing knowledge of water and development. Watch and listen to his conclusive comments