In the three days that followed the 9/11 terrorist attacks, when all commercial flights above the continental US were suddenly suspended, a veil was lifted on the profound, though until that point unconfirmed, effects that aviation-associated artificial clouds are having on our planetary environment.
Often when the topic of "chemtrails" come up, the knee-jerk response is to view them as "conspiracy theory," owing to the fact that the evidence of our senses -- i.e. actually seeing them with our eyes -- is not considered evidence enough. We are made to believe that only Science, and its primarily excreta: peer-reviewed, published research can vindicate eye witness or anecdotal accounts.
Perhaps you've heard about Morgellons Disease, and by now you know about GM (genetically modified) food, but the link between the two, is possibly connected according to Professor Joe Cummins, Professor Emeritus at the University of Western Ontario. Most people are aware that soybeans, canola, and corn are GM foods ubiquitous in our food chain. However, Sadly 75% of US food contains unlabeled GM ingredients.