I found this.

After looking at this:

So climates and rainfall patterns can be warped and shifted by the presence of trees. Trees capture groundwater, prevent erosion, capture water, increase water vapour in air, which then forms clouds which then rain. Also, they can serve as 'pathways' for water vapour from oceans to enter inland, and form clouds.

I find this pretty neat. I might try and put this into worldbuilding. Water in the deset, and all that. High powered attempts to alter climate permanently.