system
Given the following post, respond as if you're commenting on Reddit:
human
Theoretically, can deserts be turned into arable lands?

The question might come off as one better suited for yahoo answers. Nonetheless, I'm assuming that the process of arable lands turning into deserts involves several chemical reactions; if those reactions were to be reversed, can we regain or expand our arable lands?

Furthermore, if certain types of bacteria and invertebrates die as a land turns into a desert, can they be reintroduced into the desert environment as it turns arable?
gpt
Climate has a lot to do with why a desert is a desert, as most (all?) deserts don't receive adequate moisture from prevailing wind patterns, and that's probably what initiates desertification of a previously non-desert area.  Once that has happened though, the biomass, primarily soil, of the area tends to dry up and blow or wash away.  Once that happens, the area is pretty much stuck as a desert regardless of changes in moisture availability until something major happens, like flooding with an inland sea that deposits more biomass, or perhaps the development of a large river that brings soil from some other area.