I thought Caroljane and Michael had some interesting brainstorm results, laid out below. I also had some storms of creativity ... which I will add once I finish furiously scribbling notes on a break by the river. We have secretly kept everything green behind our fencing, despite the water-restrictions. I hate when Israel steals our clouds all summer.
My basic notion is weather weapons, weapons of war, that is what the protagonists come to be up against, discovering and destroying the military-industrial-scientific projects that have been used to manipulate weather events in aid of endles