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It is, however, more difficult to predict the causes of extreme events resulting in acute short-term pollution events. Again, integrated and modern approaches should explore causes and address consequences of extreme events. Green areas in cities can function as storm-water retention basins and mitigate the load on conventional sewage systems. Such solutions are not only less expensive than traditional ‘concrete' infrastructure, but also provide a wide array of co-benefits for local economies, social communities as well as local economies (EEA, 2015a).