This is a decent, but long, article from 2015 about chem trails. They consist of Aluminum, Barium and Strontium according to this. I've read the same thing elsewhere. The article calls this the New Manhattan Project.

https://www.activistpost.com/2015/07/aluminum-barium-and-strontium-new.html

I give the government credit for making things worse. It looks to me like they're the ones creating climate change.