Desertification is a complex process to understand as it has many aspects to it. One thing that is important to remember is that naturally occurring desertification is expected to occur within a continually shifting environment, as is Earth. There are many ecosystems that rely of a desert habitat for survival that have naturally formed over exceedingly long stretches of time, thus, it should be damaging to try and manually change these areas into more fertile lands.

However, the threat of desertification from human enacted causes such a climate change cannot be understated. As mentioned in my previous prompt, non-natural desertification can occur for several reasons. Deforestation, inappropriate farmland usage and global warming are key variables that are impacting local ecosystems. These are non-naturally supported and can devastate ecosystems that are prexisting within this environment. As such, it's important to make sure these lands do not undergo desertification as it would not be expected under natural circumstance.

The debate surrounding terraforming, which is what you have suggested, is under continual debate by scientists. It's currently believed that trying to terraform en masse could lead to significant environmental damage and destruction based on the methods that are used. For example, if a certain tree is planted in a deserted area and maintained to attempt to terraform the area, that type of tree may not be suitable for that environment. Or it may compete with other nearby flora that may not be able to compete with the non-native tree. Changing such a large amount of space as you have mentioned would take a considerable effort and it would have to be done in a very careful manner to prevent damage to local ecosystems.

To put it simply, whilst it's certainly possible to terraform the entire earths deserts. The potentital environmental destruction that it may cause does not appear to be worth the risk at this point in time. When it comes to more localised terraforming, such as undoing effects of deforestation, these terraforming methods may be more applicable to that environment and may have a positive effect on the environment.
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