Peru: A billboard creates drinking water out of thin air

The billboard pictured here is real, it's located in Lima, Peru, and it produces around 100 liters of water a day (about 26 gallons) from nothing more than humidity, a basic filtration system and a little gravitational ingenuity.

The billboard is located in Lima, Peru, the largest city in Peru and the fifth largest in all of the Americas, with some 7.6 million people (closer to 9 million when you factor in the surrounding metro area). Because it sits along the southern Pacific Ocean, the humidity in the city averages 83% (it's actually closer to 100% in the mornings). But Lima is also part of what's called a coastal desert: It lies at the northern edge of the Atacama, the driest desert in the world, meaning the city sees perhaps half an inch of precipitation annually (Lima is the second largest desert city in the world after Cairo). Lima thus depends on drainage from the Andes as well as runoff from glacier melt — both sources on the decline because of climate change.

According to Mayo DraftFCB, the billboard has already produced 9,450 liters of water (about 2,500 gallons) in just three months, which it says equals the water consumption of "hundreds of families per month." Just imagine what dozens, hundreds or even thousands of these things, strategically placed in the city itself or outlying villages, might do. And imagine what you could accomplish in any number of troubled spots around the world that need potable water with a solution like this.