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Don't forget hail prevention. In Germany, water shortage is generally no problem, but thunderstorms over crop are, so several regions in the South are maintaining 'hail flyers'. However, the actual effectiveness of hailbusting is disputed.

It's probably worth to note that some of the impressions in the different shots are caused by their respective depth of field. In the wide angle shot, foreground and background are well focussed, which is not hard to achieve with this optical setting and the brightness of the scenery. However...

Worth noting down for the discussion about modern jet engines is also the high amount of soot in the exhaust clearly visible e.g. around 19:08. Incomplete combustion - less water exhausted.

An example about the reception of chemtrail satire in believer circles (Facebook):

For reference purposes regarding the bag shown in the picture, here is the product page of the manufacturer. Note also that the product ID which is visible on the original (lower right, inside the box) was not changed for the hoax picture. It says "PB 86/01-a" in both versions.

The 'disclaimer' can be found at 15:14 : "Let us project our present knowledge with a little imagination and speculate how satellites may be used in future operations from a world wide weather center." It's just a speculative and imaginative projection, based loosely on the scientific...

It is likely that the most obvious methods to avoid contrails are leading to higher fuel consumption (lower flight levels, detours around humid areas). So it must be determined which measure has the least overall impact. Anyway, it's simply confusing to mix all effects of jet traffic together...

As I understand it, there are different definitions of 'pollution' in use in this discussion. Metabunk members refer to the common usage of the word, which includes all unwanted chemical products of combustion in jet engines. @rezn8d however counts in all unwanted effects associated with...

For future "sea creature" debunkings, it may be useful to keep in mind that there are gadgets around like the Seabreachers:

Indeed, this would explain the relatively small size of the boat and its faint colour (probably blue or black), compared to the bigger white ones moored in the bay. It would also mean - in the light of the high acceleration and speed these things are capable of - that the 'trail' didn't have to...

The "Daily Mail" and other publications have picked up a story brough up by one "Engineer Pita Witehira". The Google Maps satellite view of Oke Bay in the North-East of New Zealand allegedly shows an unexplained phenomenon: a long darkish strip resembling a giant snake between two curved lines...

Yes, but do you believe that this is a facebook group of actual 'chemtrail' pilots?

But you don't think it's genuine, or do you?

I agree that air traffic impact on the environment has to be focused on, given the growth rate we are seeing. It will indeed become a huge problem for airlines. However, it's obvious from the papers you quoted that there are two separate aspects to the exhaust of jet planes and its impact...

@hiilikeyourbird, you have disagreed with a post I wrote earlier, when I said: "Aluminum is also a component of various sorts of clay. The percentage is not as high as in bauxite, but the common lab test will indicate it clearly." I'm honestly interested what bit of that sentence you are...

Yes, the "sharp edge" term was not the best description of what made me dismiss snow flakes. It's the overall optical and 'aerodynamical' property of the stuff. Snow is less opaque and somehow moves differently when I recall my memory (which has some fresh entries labelled "snow" from last...

Many videos from that YouTube user mention "Belgium" in the title. I think it's safe to assume that he is based there and the video is shot in the moderate part of the northern hemisphere.

The sound indicates a fairly strong wind hitting the camera microphone, so the movement of the particles is nothing mysterious. However, they remind me rather of petals blown away, like at the end of the blooming season in the vicinity of an orchard. I have seen similar "snow" events in my area...

My impression is that even this simple statement is met with incredulity - because people know how aluminum is supposed to look like. Slightly shiny and cold, like in a windows frame. That just can't be in soil naturally, can it? So the central point is that there are substances with properties...

I am convinced that in this case, it is unavoidable to clear up the misunderstanding because it is so central to the CT. The soil tests come up like on cue every time the contrail persistence issue is exhausted. On the other hand, I'm confident that the principle of molecules can be explained...