Originally posted by Bangin
And now we see them talking about dispersing carbon black dust in the air:
This study by William M. Gray, et al., investigated the hypothesis that "significant beneficial influences can be derived through judicious exploitation of the solar absorption potential of carbon black dust."21 The study ultimately found that this technology could be used to enhance rainfall on the mesoscale, generate cirrus clouds, and enhance cumulonimbus (thunderstorm) clouds in otherwise dry areas.
The technology can be described as follows. Just as a black tar roof easily absorbs solar energy and subsequently radiates heat during a sunny day, carbon black also readily absorbs solar energy. When dispersed in microscopic or "dust" form in the air over a large body of water, the carbon becomes hot and heats the surrounding air, thereby increasing the amount of evaporation from the body of water below. As the surrounding air heats up, parcels of air will rise and the water vapor contained in the rising air parcel will eventually condense to form clouds. Over time the cloud droplets increase in size as more and more water vapor condenses, and eventually they become too large and heavy to stay suspended and will fall as rain or other forms of precipitation.
And perhaps the smoking gun of chemtrails, they admit (In Chapter 4) that the best way to "disperse" the carbon black dust is by using jet engines:
Numerous dispersal techniques have already been studied, but the most convenient, safe, and cost-effective method discussed is the use of afterburner-type jet engines to generate carbon particles while flying through the targeted air. This method is based on injection of liquid hydrocarbon fuel into the afterburner's combustion gases. This direct generation method was found to be more desirable than another plausible method (i.e., the transport of large quantities of previously produced and properly sized carbon dust to the desired altitude).
As you say, "C'mon! Jets leave contrails. It's water vapor, nothing more." In fact it appears to be much more.
There is also mention of using "chemical nuclei" to seed clouds in order to suppress precipitation:
If clouds were seeded (using chemical nuclei similar to those used today or perhaps a more effective agent discovered through continued research) before their downwind arrival to a desired location, the result could be a suppression of precipitation. In other words, precipitation could be "forced" to fall before its arrival in the desired territory, thereby making the desired territory "dry."
Hey I won’t deny that it is possible to do these things. There is, however a huge gap between the possible and the practical.
For instance, look at the carbon black issue. What they are talking about here is leaving a big black soot trail across the sky. Have you seen one of these lately? Furthermore, they don’t mention the altitude that this will take place at, but I imagine that it would be rather low, not at 35,000 feet. Consider also the amount of fuel they are talking about here. I don’t see the major airlines going along with this given that fuel costs are one of their major expenses.
Furthermore you are talking about a significant change to the design and operation of a jet engine. You can’t just do that without a huge number of people being in on it. You have the aircraft designers, the engineers, the mechanics, the pilots, the ground crew, etc. You have to change the aircraft certificates, operating manuals, etc. It would be pretty hard to keep something like that a secret.
Please answer one question for me.
What is the purpose of chemtrails?
Yes, it was THAT low. 
At this point, weather modification seems to be the front runner. Truth be
told, these methods can open a whole new door that'll lead to MANY possibilities. Either way, modifying the weather doesn't seem appropriate to
me. 
how’s that for some bad clichés? ) 
