It’s true as one can argue there wasn’t that many planes yet but then none left these trails and those who lived by airports then didn’t see them either. Now people are starting to take videos of spraying from inside planes looking out the window. I few in a lot of planes many times by or behind the wing and never saw them. I’m guessing close up can’t say for sure contrails are not seen close up but chemtrails are.
My concern for the environment isn’t just land, life forms, and neurologists worried about the effects of elevated heavy metals in people but life itself. There is some say 50% to 80% average 70% of oxygen is made by phytoplankton in the ocean that needs sunlight to survive and doesn’t just supports ocean life but it’s byproduct is the oxygen we breath. Between polluting the oceans including with radiation and shutting off the light we will be on that extinction list too. This process also contributes to the ozone layer that needs oxygen.