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The picture below shows villages in sub Sahara Africa. Each village is surrounded by mound of sand dunes. Moving masses of sand endanger houses and  keep village from growth. Local people are fighting desertification by building rectangular grids on the surface of dunes. This grids are made of tree branches or any other biological material, which prevents the sand grains from blow of the surface of dune. One of the main problems is that the geographical location of the Sahara desert does not enable simple growth of vegetation on its dry, parched surface. Also poor locals often collect this wood to obtain firewood for use in kitchens. 

I see here the potential for use of my delta robot which could in first phrase supply the anti desertification grid and in second phase create new inhabitable spaces inside of solidified dunes.

Active dunes covered with anti-desertification grid