In a very positive move, You tube has added a link to the Encyclopedia Britannica article on Contrails to most of the videos that promote the "chemtrails" conspiracy theory. It's a great article to use as the initial excerpt directly addresses the most common misconceptions about contrails - the idea that they always quickly dissipate. It's also a great quote because the Encyclopedia Britannica exists in print, where it says the same thing. here's a clip from the 1983 edition https://books.google.com/books?id=SBM8AAAAMAAJ&q=contrails+"last+for+several+hours" (If someone can find a better image of this, I'd greatly appreciate it!) And of course there are many other books that say the same thing, as I described in this thread, and video https://www.metabunk.org/debunking-...a-study-of-70-years-of-books-on-clouds.t3201/ Source: https://www.youtube.com/watch?v=X72uACIN_00 (which ALSO has the EB Contrail article linked) While this might elicit cries of "propaganda" or "censorship", the information provided is both accurate and verifiable. I think the addition of neutral factual information to an otherwise highly misleading video is a good thing.