Pressing problems facing humanity

The freshwater crisis is one of the most pressing problems facing humanity- it is often said that this is due to the mismanagement of water. When it comes to water management, the Supply-Side and later Demand-Side approaches are considered the traditional management system. However, the world is moving towards a more sustainable style of management. What is this newest approach to water management known as? Explain how it is different from Supply Side and Demand Side Management emphasizing the advantages of the new approach.