Lots of ignorant comments in here. I'm not even an expert, but numerous scientists agree that the long-term effects of cloud seeding, aka "chemtrails" are not entirely known. However, there are known potential downsides, such as increased flooding and environmental pollution (from the silver iodide used to form the clouds). There are also other downsides to it, but I'm not going to dive into all of that because I'm lazy.

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4851009

In short, banning cloud seeding isn't that bad of an idea. Whether the cons outweigh the pros (increased precipitation is good for farmers/crops), that's a debate worth having among our legislators and the scientific community.