Weather Modifications:
With the dry? that induces such problems in the area, in a not for us to have the technology and / or the resources to help them? Furthermore, I wonder why? desalting plants are not installande on a large scale in the dry? future.
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Mainly because weather modding in one place will cause problems in another. When you significantly change the rainfall and temperature in one area, other areas adjacent to them will also change to balance out those changes… not all of which are good. (Katrina in New Orleans was a nice warm winter in southern Ontario, Canada)
The main problem with all the droughts is due to global warming and excessive local thermal traps. Without finding ways to cool largish areas, these kinds of problems will keep occurring.
I think it would be much simpler to keep a few large warehouses in every city chilled & filled with winter snow to be kept cold from each winter. Then when water is needed, just ship the snow to wherever needs it… All northeners complain about how much snow they hate… Let’s ship it south!
Before you can think about cloud seeding you have to have the clouds to seed – and they are not there in a drought. You cannot make clouds. In any case, the results of cloud seeding experiments, of which there have been many, are ambiguous. There is no real evidence that this very expensive process works. If it does work, it only slightly increases rainfall in areas that get a fair amount of rain in the first place.
There have been a lot of cloud seeding experiments and the results show marginal improvement in rainfall at best, certainly not enough to make it economically beneficial.
Desalination plants have up to now been expensive to build and expensive to run. The technology has improved and you will see more of them. But it is only economic at this stage for domestic consumption, it is not economic to provide the vast quantities of water for agriculture, cheaper to import the goods from places with good natural water supply.