In a recently published paper, atmospheric scientists specializing in contrails were asked what caused various photographed phenomena that "chemtrail" believers frequently identified as evidence of a secret large scale atmospheric spraying program. They unanimously identified the photos as ordinary contrails, and gave physical explanations for the various things shown in them.
As a response to this paper (which also covered chemical tests, and of which I am a co-author), the web site "Geoengineering Watch" published a response, the most prominent part of which being a video of a jet leaving a trail, titled "Irrefutable Film Footage Of Climate Engineering Aerosol Spraying".
Source: https://www.youtube.com/watch?v=iK9nVR9H34g
With the accompanying narration set to dramatic music:
http://www.pa.op.dlr.de/~pa1c/JAS66_217-226_2009.pdf
The "deepest gratitude" to Douglas Huang seems somewhat misplaced, according to this account:
http://www.shiftfrequency.com/chemtrail-spraying-video-proof/
Source: https://www.youtube.com/watch?v=t22wy4c-A-A
Source: https://www.youtube.com/watch?v=yZNtfWf76Hw
Source: https://www.youtube.com/watch?v=OKSE4YYl6oM
Source: https://www.youtube.com/watch?v=dHH8CL2KD3o
And countless photos:

One photo including an aerodynamic portion to the contrail was included in the study:

The 49 contrail experts were asked about this. They all said the photo showed contrails, (although their explanations of the colors varied slightly between refraction and diffraction). Here are some of their comments (note these are from survey responses, and so several contain typos):
Consider also what was written in the description of the video:
- It is not an exhaust contrail - It's an aerodynamic contrail. It has nothing to do with the engines
- This type of jet engine makes MORE contrails. The idea that high bypass jet engines cannot make contrails is one of the most nonsensical claims ever put forward by the chemtrail community. Jet engines make water. The amount of bypass air does not change this. This claim has been refuted in great depth here.
Again this simply proved to be an aerodynamic contrail (this time between some exhaust contrails, as in the study photo).
And this was explained in great depth in this thread:
https://www.metabunk.org/debunked-d...ircraft-spraying-aerodynamic-contrails.t4454/
Another "undeniable" and "inarguable" piece of evidence from last year
Was just a well documented fuel dump from a Thai Airways 777 flying from Munich. This was extensively documented here:
https://www.metabunk.org/new-fuel-dump-chemtrail-video-munich-thai-airways-flight-925.t6541/

In fact all the pieces of "evidence" that GEW used to "rebut" the study have been discussed, and debunked here, usually years ago. The NOAA "gag order", the "historical documents", the patents, high bypass engines, "retrofitted nozzles", "global dimming", tests for aluminum, ozone destruction, biosphere freefall, and legal actions.
All discussed, mostly debunked years ago. But ignored, and then regurgitated by Geoengineering Watch. I do not expect this pattern to change. But I hope that people can at the very least have a look at aerodynamic contrails and recognize that videos of them are not "irrefutable" or "inarguable" evidence of anything other than normal atmospheric physics.
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