ELI5 Cloud Seeding - can it solve drought issues?

Why can't we seed clouds to solve California's drought problem? How does seeding clouds even work? Which countries and states have used the technology? Who legally owns a cloud?

 

... We explain like i'm five!

 

Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: grenata, ratelslangen2, irwin96, drkobbe, kaseyB, steavee and shaggorama

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