> Deforestation is a common cause of desertification worldwide. Trees help to capture moisture from the air and bring it to ground. Cut them down, and the moist air blows past. Trees are commonly cleared for farmland, and then the farmland has to be abandoned when it gets too dry.

Trees alone do not help. There are a lot of tree farms which do not capture moisture and are prone to forest fires. We need forests with good ecosystems not tree plantations.