system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can't California seed clouds to cause rain to fall similar to what China did before their Olympic games?
gpt
Wat do you mean? Create clouds to produce rain and prevent drought? Because that's not what they did in China, there they only caused existing clouds to drop their rain before they reached the area they wanted to protect. 
EDIT: and even that was extremely expensive, so not really applicable for large scale use.