Making the Desert Productive
The idea is known as the Sahara Forest Project, and it's intended to be replicated throughout the arid region.
"The Sahara Forest Project's (SFP) first facility will be located on a 2,000,000 square meter (21,527,821 sq. ft.) plot of land in Aqaba, a coastal town in the south of Jordan where it will be a test bed for the use of a combination of technologies designed to enable the production of fresh water, food and renewable energy in hot, arid regions."
"...The main pillars of the project are saltwater greenhouses, concentrated solar energy, and cultivation of traditional crops along with energy crops such as algae, which all come together in one location to solve a whole range of environmental problems."