Here is an interesting idea which could allow sustainable agriculture to be deployed even in the most arid places on Earth. The project is called Fog Tower and it consists of a helical structure that absorbs and sewers water from surrounding areas. The designers of the Fog Tower are Alberto Fernandez and Susana Ortega and they are planning to install the concept in some areas in Chile.

Coastal Fog Tower
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The Coastal Fog Tower could provide a sustainable agriculture at the edge of Atacama Desert and its technique was inspired from a unique fog type specific to Chile called Camanchaca. This bizarre fog spreads from Northern Chile all the way to Peru and it's condensed into a cloud at 200-400 meters above the surface.

The technology of the helical tower consists of channeling the moisture and sending the water to the basement then the minerals in the water are filtered through reverse osmosis system which is also very efficient. After these processes, the water is distributed via a system that produces 2-20 liter per square meter which means about 20,000 to 200,000 liters per day.

I guess we will have to wait for more information about the tower because if it were to rely only on these details then this technology looks almost perfect. Also, it would be a huge step if it could help to the development of sustainable agriculture near desert areas.