You are describing aircraft con-trails.
The milky white is classic results after they have been over a few hours ago
The argument is that its different atmospheric conditions -- do you see horizon to horizon trails or is it now milky white
Who says its designed to be breathed in - and no its doesn’t need thousands to be involved, you haven’t been paying attention.
What is?
Some say its to reduce the streangth of the sun - which it does when it has spread out to form a milky blanket. Some say the cocktail of elements within is to enable certain military communications, some say its to poison us - although that may just be a side affect of the first two.
That is the standard lazy debunker trope. Have you seen the latest UFO disclosure around the Apollo 11 and 12 missions kept secret for 50 years - people have been called conspiracy theorists for years and now its been released it seems they were right all along and it was kept secrete for 50 years quite easily.
What do you mean "what is" -- do you even know what thread you are posting in
There is nothing to believe in -- just look up which you refused to do
What do you think?
Ummm....no. It's a perfectly natural thing called clouds. Apparantly they occur all over the world and have been doing so from way back before manned flight was possible. You'll be saying next that old coal fired powerstation cooling towers used to emit the same chemicals and now that they have gone planes have taken over.
I dont have a theory on the why
