How about chemtrails does not seem to be supported by people with good scientific knowledge.
Unfortunately "science" gets a bad name. Many in the conspiracy community feel that mainstream scientists are all in the pay of the government. They don't trust them, so instead they place their trust in people they consider to be "good" scientists, like Dane Wigington or Clifford Carnicom.
So an appeal to authority will like have the opposite effect that that which you intended. Best instead to focus on the fundamental claims of evidence, and try us authorities it is hard to argue with, like 70 years of books on clouds.