Verified Answer :

The most common cause of desertification is climate change, since most of the relevant climate change that is happening right now is causing the earth's surface to heat up--leading to evaporation.

The
most common cause of desertification is overgrazing because the plants are
exposed in too much grazing for a long time. This kind of problem will cause to
poor production of the plants and result to soil erosion and desertification.
Overgrazing can also affect the water
and animals and the plants. Animals will suffer pasture shortage. Since
overgrazing already affected such area, the soil fertility and organic started
to lessen until there will no longer be present. This is a very serious
problem.