Observations alone are not scientific. Observation is how they determined the earth was flat long ago. Look how that turned out. Science proved observation wrong as it often does. No one has proven the science that explains how contrails form and persist wrong yet. You certainly haven't. The comment is correct, " not a single bit of scientific evidence has ever been presented that suggests chemtrails exist". The only thing you should be smelling and tastng in the air is all the bullshit you have been spreading. Those are the only chemtrails I am aware of.