no. I had a final in college that included a calculus based equation as to how quickly a contrail would disappear. Homeostasis. Pretty quick. Cool dry air was a requisite. They are spraying. Some of the reasons are military. They can bounce sonar better. Hopefully when the bad guys are done this will end. BTW there have been people who have gotten samples of the air. Additionally in Hawaii which has no natural aluminum they are constantly making alum. resistant GMO corn. Was their on vacation and saw I guy soil testing and asked for and he said aluminum levels in the soil. Was an ATV tour on Kauai.