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From what I've seen, these trails are only noted in NATO countries. I may be incorrect about that because I haven't done any comprehensive research into where they appear, but if that's the case then we are only talking 28 countries rather than the whole Earth. Of course, that begs the question that if it is geoengineering why just limit it to NATO countries, but that is what we are doing...questioning.
The most optically efficient aerosol for climate modification would have sizes, Rp, of the order of 0.1 μm or somewhat less (here we use radius rather than diameter as the measure of particle size, and assume spherical, homogeneous particles at all times). Particles of this size have close to the maximum backscattering cross section per unit mass; they are small enough to remain suspended in the rarefied stratospheric air for at least a year and yet are large enough and thus could be injected at low enough abundances to maintain the desired concentration of dispersed aerosol against coagulation for perhaps months (although long-term coagulation and growth ultimately degrade the optical efficiency at the concentrations required—see below). As the size of the particles increases, the aerosol mass needed to maintain a fixed optical depth increases roughly as ∼Rp, the local mass sedimentation flux increases as , and the particle infrared absorptivity increases as (e.g. Seinfeld & Pandis 1997). Accordingly, to achieve, and then stabilize, a specific net radiative forcing, similar to those discussed in §2d, larger particle sizes imply increasingly greater mass injections, which in turn accelerate particle growth, further complicating the maintenance of the engineered layer.
Originally posted by coyotepoet
reply to post by Essan
Now, if someone were claiming that noctilucent clouds ... were evidence of stratospheric spraying for geoengineering purposes, then maybe they would have an argument worth discussing further?
Is that what you are claiming? Because that is a valid possibility as well.
What's interesting is that the overwhelming number of "chemtrail" spotting is done in English speaking countries, or countries that have a large proportion of people who speak English as a second language. This suggests that the whole "chemtrail" phenomenon is a verbal meme.
Those same countries happen to also be the ones with the most commercial air traffic. You aren't going to be seeing a lot of Contrails in places where nobody travels by air. Even in the US, the trails are much more common in the congested Northeast and very rare in the rural Southwest.
those of us who do are not prone to assuming conspiracies whenever we see something we can't immediately understand.
and yet on some days the sky is filled with lines from horizon to horizon even when the weather/temperature is not conducive to contrail formation.
11/11/09: Appearing on the Charlie Rose Show, Freakonomics author and University of Chicago economist Steven Levitt argues that pumping sulfur dioxide through garden hoses into the stratosphere to build a sun-blocking haze is the "so sensible" solution to global warming.
Transcript:
LEVITT: So, it seems like if you really think global warming is a terrible problem, you need a solution that's faster, and that's more certain, or easier to do. So, turns out geoengineering, extremely controversial but so sensible.
I mean, there are ideas out there that are cheap, they're totally versible, totally reversible, which is incredibly important. You wouldn't want to do anything that's irreversible, because the science isn't that certain. And they don't require massive behavior change. We're not saying we should go out tomorrow and build one of these machines say, to put sulfur dioxide in the atmosphere, but what we are saying is, "How can that not that be part of the debate?" We're just trying to give geoengineering a seat at the table. . . .
ROSE: Explain how it would work.
LEVITT: It's pretty straightforward.
ROSE: You pour sulfur dioxide in the air and it puts a shield.
LEVITT: Exactly. It puts a shield. Really, the science is based on what Mother Nature has been doing for eons, which is when there are big volcanic eruptions, among the other things that are spewed out is sulfur dioxide. And it sprays it so high it gets into the stratosphere. The key is that getting the sulfur dioxide into the stratosphere where it forms into this haze which reflects something like one to two percent of the sunlight. And that's enough to cool the earth. And all you need to do is just have a steady flow of it. And if you can figure out a way to get it up there, Nathan's idea and his compatriots is to just essentially build a glorified garden hose. They put one at the north pole and south pole. It sounds like scientific fiction, but they have the engineering solution. It wouldn't be that hard. And if you don't like it, you just turn the spigot off . . .
Category:
News & Politics
Tags:
global warming SuperFreakonomics Freakonomics geoengineering Levitt Myhrvold Steven Levitt Charlie Rose climate change science fiction
Originally posted by Dilligaf28
reply to post by MathiasAndrew
You are assuming compressed particles, that the particles are suspended in a liquid prior to release, and that the spreading of these particles would leave any sort of a "trail".
Care to readdress me without the assumptions?
2 ) The liquid I was referring to was water vapor in the atmosphere.
Originally posted by Phage
reply to post by MathiasAndrew
2 ) The liquid I was referring to was water vapor in the atmosphere.
Water vapor is a gas, not a liquid.
Why would water vapor cause aerosols to "condense"?
edit on 3/28/2011 by Phage because: (no reason given)
Originally posted by Dilligaf28
reply to post by MathiasAndrew
Keep right on nit picking and offering all sorts of statements other than a direct answer of my initial question. You have yet to explain why you are able to determine how the particles will behave and will be dispersed. Not to mention how is it you know that the geoengineering particles will form a visible trail?
I ask this because the document I provided (which was in response to your statement that you dont know who is saying the particles would be invisible) has yet to be discussed in any of your responses.
Secondly being an outdoorsy type, having a horticulture background in my education, I started to notice trees were dying off in my area, Rosalind Peterson has done some some very good research in Sonoma CA that illustrate how these "strange chemtrails" could very likely be a big cause of these dying and unhealthy trees popping up at a rapid and unatural rate. I was also noticing that I couldn't see stars at night anymore hardly, even when we were camping in places where the stars where once so beautiful, and city lights couldn't cause what was once a sky full of stars to dwindle so drastically. The days seemed to become more overcast, more often, but still at this point I had not made the connection.What finally connected the dots for me was when I was traveling through CA and started to notice these weird trails in the sky left by airplanes in these bizzare tic tac toe type patterns by several planes at once? I had never seen anything like this in my life! Then it got even weirder when I was traveling long enough distances to actually watch the whole sky change to a milky color, and then once I drove far enough away the sky would go back to normal where the planes weren't flying. Now that I am paying attention I see these things almost daily, and it seems to be esculating! There is no doubt in my mind that these are not normal contrails that I have seen most of my life, just plain commen sence to me.
Originally posted by coyotepoet
reply to post by network dude
In my defense, I did break the rules of that thread and provide evidence for my thoughts.
Sarcastic much? In my defense, I did consider your suggestion, sarcastic or not, as a valid possibility. I suspect that is more than you did for the other items on the list.
Originally posted by coyotepoet
Are you willing to admit that at least some of the trails across the sky are indeed “chemtrails” whatever their purpose may be?