water vapor contrail that diminishes quickly
Why does it do that?

and the denser and more persistent whitish smoky contrail that lingers and expands over a period of an hour or more.
That’s not exactly what it does. In the saturated air of a humid stratospheric layer it cannot “diminish” for it cannot sublime into water vapor in the at all, in fact it puts on weight as it falls until it reaches the troposphere where it evaporates.

The incorporation of artificial particulate matter
And your reason for writing that was what? The only “particulate matter” is ICE CRYSTALS, with TRACES of SOOT PARTICLES and ACID MOLECULES.

allows the latter type to hang in the sky for long periods
NOTHING “hangs in the sky” for long periods. Solid material objects (like ice crystals) have WEIGHT and FALL. Slowly, in barely saturated air, but speeding their downward fall the more humid and saturated the ambient air is.

People can even spot artificial cloud cover when they step out their back door, especially when they know that the humidity level is too low for real clouds to occur.
That PLAINLY DEMONSTRATES your failure to understand what you are talking about.
Firstly, the reason why you can’t tell one trail from another is that THEY ARE ALL ICE CLOUDS just as CIRRUS clouds are ice clouds.
Secondly these trails are NOT being made in YOUR weather. They are made five to eight miles up in a part of the atmosphere called the STRATOSPHERE, where the sky runs by a different set of rules.
It is bitterly cold at its BASE (-40 or colder still) and gets WARMER with increasing altitude.
The BASE of the stratosphere is just ABOVE the TOP of the ANVIL of a large cumulonimbus cloud. That’s the only time its easy to spot, although you sometimes see a thin mist of cirrus there. Also, the “afternoon white-out” sometimes caused by many persistent contrails joining up is up there, at the BASE of the stratosphere, for beneath it the falling ice crystals WILL be evaporating into what you know to be “your weather”.

What do you say to that? You’ve been WRONG every time… Why do you think that is?

However, chemtrails are.

experimenting with weather modification for decades. I can clearly see contrail clouds

Not weather modification: cloud seeding. Weather modification would not be done in the stratosphere because there are no rainclouds there – of any sort.

A massive cloud seeding and cloud spraying operation are happening as well.

Persistent contrails are formed in ice-saturated stratospheric layers. Crossing shuttle flights at regular time spacings will create that effect in the sky quite normally in such an event.

They have fine tuned their methods so that no more green and lavender clouds appear.

“Green and lavender” clouds occur normally in nature according with changes in solar spectral insolation and ground-reflected light.

I do not believe it is sinister. By creating cloud cover the effects of global warming are mitigated in the treated areas.

Nice theory. For how long is this “mitigation”? Where are the figures?

I have observed flight formations and obvious spray patterns many times

“Flight formations and obvious spray patterns” – are the consequence of airline business.

I suspect that the major ingredient in these clouds is water.

Every engineer since James Watt could have told you that.

Some type of polymer or salt is essential to geometrically spread out.

NO. The dispersion of a trail to TEN kilometers WIDE by ONE kilometer DEEP takes hours and involves the UPTAKE of up to TEN THOUSAND times MORE ICE from the saturated water vapor in the stratosphere. It is spread by the ROTATIONAL ENERGY of the aircraft’s WAVE VORTEX.

It is an amazing sight to see square clouds and tire tracks in the sky.

One glance at one of those “All air travel in a day in 60 seconds” videos would put you straight. Aircraft routes cross EVERYWHERE!

The conspiracy buffs think they have this pegged but I think there is a more rational explanation.

I’m not sure about that.

Global warming is far worse than even Al Gore is stating.

I cannot agree. When I look at the evidence I see nothing that leads in THAT direction.

To think that the military and pharmaceutical companies have conspired to poison us is just to far out there for me to swallow.

That appears to be D-I-Y hypocrisy. Your bag.

Hence the massive contrail imagery on all forms of advertising.

It’s massive neither in the skies as a whole, nor in advertising imagery. You searched it out… No?

It is just acclimatizing us to what we see every day. Thank you for the sight.

It’s banally normal. It’s physics. Go get yourself INSIGHT.

If you never noticed it before, how do you know when it started?

I’m not sure why you think it’s not natural air traffic. Could you be more specific?

For a brief time residents of Dayton were sure a comet had appeared in the sky. They had mistaken the trail of vapor escaping from the machine as it sped downwards for a “stranger in the heavens.”
The exhaust gas from the airplane freezing in the frigid temperature, caused a cloudlike formation, resembling the tail of a comet, to hang below the clouds.

Sounds like it was a fairly short contrail. Still, something they had never seen before.

It reports of people confusing a contrail with a comet:
http://g.imagehost.org/download/0688/1920

1. Contrails are normal. The weather and engine dynamics determine their formation.

2.A massive cloud seeding and cloud spraying operation are happening as well. They have fine tuned their methods over the last several years so that no more green and lavender clouds appear. I do not believe it is sinister. By creating cloud cover the effects of global warming are mitigated in the treated areas.
I have observed flight formations and obvious spray patterns many times. I suspect that the major ingredient in these clouds is water. Some type of polymer or salt is essential so that the radio frequency sent into the cloud can cause it to geometrically spread out. It is an amazing sight to see square clouds and tire tracks in the sky. The conspiracy buffs think they have this pegged but I think there is a more rational explation. Global warming is far worse than even Al Gore is stating. To think that the military and pharmaceutical companies have conspired to poison us is just to far out their for me to swallow. Hence the massive contrail imagery on all forms of advertising. It is just acclamating us to what we see every day. Thank you for the sight