As a former Occupy Wall St. admin, I can't say enough about the need to confront this outright BS and I'm surprised the science community hasn't taken this on more aggressively! These conspiracy theories muddy the waters for all activist groups to the point that little else has become possible. When I confronted this conspiracy head on seven years ago, they then decided to add the notion of geoengineering--LOL--as if we all didn't already know (and 9/11 temp averages proved out) that white clouds from normal contrails do effect temps.
Since the supposed chemicals are often the very same used in FRACKING, I'm hazarding a bet this was all started by the frackers to say, Hmmmm, its not us. Instead of protesting pesticides, climate change, Fracking et all.... people have become focus locked on this one issue; I guess the only way they feel the need to protest is to change a profile pic on fb to confront a gov they think is outright poisoning them.
Below have been my in-your-face attempts to stamp this shit back so take it for what these meme's are worth... Making fun of them seems about as direct way as I can figure apart from showing WWII high-alt bombers leaving similar lengthy contrails.