Some recent studies show that planting trees may create deserts instead of mediate them. There are many active projects trying to hold back or reclaim desert by putting in trees. It may be that that is not such a good idea.
I know in Texas they found if they bulldozed all the brush mesquite in an area the water table came up ten feet. But mesquite is notorious for deep tap roots that enable it to survive in arid climates.
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