Hi Indi, I think there are many reasons for the chemtrails. So far we know of at least aerosol aluminum, which we know now, gets past the blood brain barrier, so with the knowledge that we have of heavy metals on our bodies, we will probably see a spike in neurological disorders, which we already see happening at alarming rates. (Alzheimer's and dimensia )
We know now that Monsanto has aluminum resistant seeds for some crops, so when the soil gets so saturated with aluminum, which it is, Monsanto can grab the monopoly on the food supply when all the other seeds don't grow.
Another element in chemtrails that we know of is barium. And I happened to stumble on a program awhile ago about a company in Japan making touchable holograms, and a component of these holograms is a laser being fired into an aluminum and barium atmosphere. (Project blue beam)
I'm sure chemtrails have something to do with weather manipulation by themselves and in tandem with HAARP style hardware.
In recent years , I've also heard that flu viruses were detected when people were actually doing their own field research on chemtrails, but that is just hearsay, and I don't know of any controlled tests that prove that.
And who knows, it may just be one part to a two or three part weapon. Who knows. But if you've seen the Chinese "cities in the sky" it's said that's a test of project blue beam, in which you would need an aluminum barium atmosphere. I know that if I see an "Independence Day" kind of scenario in real life, my first thought is going to be that's its fake.