Saltwater greenhouse grows veggies where veggies won't grow
That's what makes the Sahara Forest Project interesting. Its saltwater greenhouse uses half as much freshwater as conventional greenhouses, and it could allow water-poor countries to grow food more sustainably while reducing the need for food imports. It could even help re-vegetate deserts in some countries.
The greenhouse has a cardboard screen at one end with hundreds of small holes in it. Saltwater trickles down from above and evaporates as it meets hot air coming in from outside. The air indoors becomes humid and up to 15 degrees Celsius cooler than normal, while the moisture condensates on the plants, helping them to grow.
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