Lack of fresh water is a general concern and will increasingly become a threat to societies in the future. The water problem is particularly acute during the summer season in the Mediterranean region when the number of people staying there increases considerably. The number of tourists is expected to double by 2025. Drinking water scarcity is likely to increase because of a changing climate. This represents a massive economic, social and environmental threat to semi-arid regions such as the Mediterranean. An important technology to tackle this problem is desalination making fresh drinking water from saline seawater. Most of the current methods, however, are neither cost-efficient and environmentally friendly. Therefore, there is an urgent need to develop a technology that would fulfill both criteria.