Parkinsonia aculeata (Jerusalem Thorn). Leucaena leucocephala (White Leadtree) is the tree without the thorns. Geoff Lawton talks about Greening the Desert project in Jordan. He has a lot of videos on YouTube talking about a nitrogen fixer with thorns and a lot more ways to create soil and clean water to use in gardens. Ways to build in Jordan that they used for living in and using. Tons of information. Desert fixing isn't easy, but it will take time.
