The only way humans could directly turn desserts into forests is through massive irrigation projects, diverting fresh water from other areas to feed the desert land. In a small way this is already going on in California and Washington state farmlands. It would take enormous amounts of water and time to turn deserts into forests and in many ways this process would not be ecologically sound because it would be depleting the water stores of another area.
Not all deserts are sandy and hot! Antarctica is classified as a desert, because of the limited rainfall each year. In order to be classified as a desert, a region has to have less than 10 inches of precipitation per year. Melt the snow that Antarctica receives and it is less than the rainfall in the Sahara.
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