Bioinspired water collection methods to supplement water supply.

Fresh water sustains human life and is vital for human health. Water scarcity affects more than 40% of the global population and is projected to rise. For some of the poorest countries, 1 in 10 people do not have access to safe and easily accessible water sources. Water consumption by man continues to grow with increasing population. Furthermore, population growth and unsafe industrial practices, as well as climate change, have put strain on 'clean' water supply in many parts of the world, including the Americas. Current supply of fresh water needs to be supplemented to meet future needs. Living nature provides many lessons for water source. It has evolved species, which can survive in the most arid regions of the world by water collection from fog and condensation in the night. Before the collected water evaporates, species have mechanisms to transport water for storage or consumption. These species possess unique chemistry and structures on or within the body for collection and transport of water. In this paper, an overview of arid desert conditions and water collection from fog, and lessons from living nature for water collection are provided. Data on various bioinspired surfaces for water collection are also presented. Some bioinspired water purification approaches are presented. Next, consumer to military and emergency applications are discussed and water collection projections are presented. This article is part of the theme issue 'Bioinspired materials and surfaces for green science and technology (part 2)'.