An estimated two-thirds of humanity is affected by shortages of water and in the developing world face a lack of dependable electricity.

Devices that uses solar power to pull water from the air could potentially serve a billion people across the world.

Converting seawater into safe drinking water takes an enormous amount of energy, which makes it a costly and polluting process.

Desalination is the answer to long-term water security, but it's also expensive and energy-intensive. Scientists are developing options.