Try to realize that most people here see through your attempts to conflate known and relatively small-scale attempts at weather modification, and investigations into contrails' effect on climate, with some sort of massive, secret "dispersion operations taking place to either control the weather or combat global warming". They are not the same thing, and we've seen this tactic many times before.
I will ask you the same thing I asked tippit: Where is your evidence for such a massive, secret campaign? How exactly would you distinguish such from ordinary contrails?
Tactic? It isn't a tactic. I simply laid out what I thought and why.
And your logic is comical. In one sentence you recognize that "small scale weather modification" does exist, but yet when it comes to a large scale "weather control ie. modification" can't exist. So with your logic, size does matter!

Rejected.
How would I distinguish one from the other. Excellent question.
1. Time lapse photography of contrails compared to non-contrails.
I've witnessed "trails" remain in the atmosphere for over an hour, spread out, and create a hazy like cloud cover above the area I live in. I've also seen normal contrails remain persistent but never spread out into a hazy cloud cover.
My grandfather, an FAA flight examiner has provided me with plenty of opportunities to observe commercial and military aircraft activity. I live in a high air traffic corridor in the midwest and very close to Wright Patterson Air Force Base. I'm very familiar with "trail" activity.
2. Cross reference condition of the atmosphere with weather radar data. On supposed "chemtrail" days, the sky is a patchwork criss cross of trails usually early in the morning. These trails then combine, spread out, and create a hazy cloud like cover for several hours. Not the typical evaporation rates of contrails. I would question why a weather radar would not show this cloud cover on an otherwise clear day.
3. If "chemtrail" residue is discovered as mentioned in the mainstream media report linked to earlier and can't be shown to originate from another source.
I've come across this stuff but was unable to get it to a laboratory for testing. At first I thought it was spider webs. It was snow white, stringy, on chain link fences and on the ground in different dispersion patterns. After touching it, the stuff dissolved in my hand into an oily slick residue. The string literally disappeared. This removed any suspicion on my part about spider webs at least those native to my location. I've also seen this white thread stuff falling from the sky in small stringy lengths as well. The same thing happened when I was examining it in my palm. This string happened on supposedly heavy "contrail" days.
4. A cross reference of alleged "chemtrail" activity with an increase in upper respiratory ailments. (see the news report I linked to earlier.) It is curious that many amateurs have found above normal levels of barium after heavy trail days.
5. The only true way to ascertain the contents of said trails is to perform chemical tests on the trails themselves or their observed "fall out".
MRC-HansBecause they have not told us about them, and they could not be kept secret. Look at this little calculation:
Area length (km) :4000
Area width (km) :2000
Coverings pr. week:1
Track spacing (km):3
Effectivity:0,50
Flight speed (kph):900
Operative days/year:300
Hours per shift:10
Shifts per day:2
Aircrew size:3
Ground crew size:7
Fuel consumption (l/km):16
Kilometers per annum:277333333
Flight hours:308148
No. of planes:51
Manpower:2157
Total fuel (tons):3697778
This is the logistics for spraying just the US, once a week. It would require a medium-sized airline. Only, this stuff goes on over the entire planet. You couldn't hide an operation like this for ten minutes. You couldn't even get through the planning phase before somebody spilled the beans, and the media would be all over you.
Hans
1. Why do you think "they" would tell us anything or everything for that matter? Non-disclosure means non-existence with your logic Hans. To you then, Area 51-doesn't exist, the Stealth Fighter didn't exist until it was publicly revealed, anything not in the public view then doesn't exist. I'm sure you can see the fallacy in your logic.
2. What were all of those calculations based upon and what in the heck does it have to do with anything? Why do you think the entire U.S. is being 'sprayed'? What leads you to incorporate that into your equation?
3. Your next wrong assumption is that someone would spill the beans if they knew about it. This is a fallacy of course and I'm sure you know why based upon some of the examples I listed above.