Wilhelm Reich and orgone provided by PORE = Public Orgonomic Research Exchange ----- © Copyright 1995-2002 **last update (2002sep23)

I did say enough said but you want a rebuttal. OK. Your lack of knowledge about Reich's work and research shows too well about CB and orgone shooters etc. You wanted quotes and proof about my statements about Don Croft misclaims yet you provide no proof about your statements About Don Croft and his devices. Also about chemtrails vs contrails you show no proof. I will give you links and info but you need to do the same.

This is typical of many who make a claim for new devices or as here that chemtrails exist or a chembuster works. When someone questions that they work; a typical response is "prove it doesn't work". This is called sidetracking the question and then expect an answer from the questioner. No answer to the first question is given of proof of operation but then you
expect questions and proof back from the questioner. The proof truely belongs with the one claiming they work. See at bottm of this email Don Croft's attitude for questions about his device.

As for contrails:
Con-trails can and do become clouds and last for well over several hours to over a day period. Clouds form by water droplets or ice crystals 1/1000000 of the size of a rain drop. Of course there are billions of cloud droplets that make up a cloud. Condensation nuclei are needed to form the clouds. Salt in the air and dust work for this. When the elevation 4-7
miles up in the sky where jets travel is moist during a warm front the contrails will normally stay for hours to over a day. When jets travel over the same elevations during a high pressure, the contrail will only last a few minutes or less than 10 or so minutes. This is standard stuff in the courses taught on Meteorology in college. I have a BS in Science and taught Earth Science for about 20 years. Meteorology is within the framework of Earth Sciences. see..jet stream for more info.......
http://www.pbs.org/wgbh/nova/balloon/science/jetstream.html


BTW PORE does not sell any books but maybe you can quote or prove where my web site of PORE does do this. I have links to others un associated to me that sell them like Amazon or the Wilhelm Reich Museum or usedbooks web
sites.


John Morrison wrote: >              Jogg wrote: >>

> > PORE offers free plans for the orgone pillows they make and sell.
> > They offer free plans for orgone accumulators that they do not sell.

> I'll have to have another look I couldn't find anything for free last
> time I was there.

You want proof about PORE stuff for free. Easy.....its almost all free. And the links are on the Main page. But you are right you should take another look. And we do not charge for everything as you claimed above. A false claim I might add of yours. In fact Pore only sells what is on the catalog page and the journal we publish. Tons of court documents, groups information,
events, and even several of the articles in the journal are free. And much much more. See these links for items I previously said were available for free:
http://www.orgone.org/articles/ax5aorcp.htm
http://www.orgone.org/articles/ax2001-grnfld-aa.htm


> "THEY OFFER"?
> Don't you mean YOU? YOUR address is PORE@ORGONE.ORG so I guess you own
> the fully COPYRIGHT site?

Yes I operate the site called PORE. I do not own all copyrights at the site. That is misinformation you are giving. Many authors who submit articles retain their own copyrights. You can print and use any items for your self. Copyright is to prevent others from using ones materials to sell to make money for themselves. One is allowed to use them for personal use.

> > You are of course not answering any proof off your own claims

> I didn't make ANY claims... You are the only one that has made claims!

Yes you have made them and even in this email you make more about me and PORE that are untrue but Cest le Vie......

> > and yes it is recommended where to get some supplies for hhg,cb

> Sorry I must have missed that. Could you give a link where to find that
> direction? OR at least a direct quote?

yep you missed it......see
http://www.metatech.org/cloudbuster_&_orgone_generator.html
==========
HOW TO OBTAIN PARTS FOR THE CB, OR COMPLETED CBS

There are two sources:

1) Michelle Ridgley
P.O. Box
Baltimore, MD 21239
email her for a price list: mr.....@aol.com

2) http://ctbusters.com

(David at davdart@texas.net also sells suitable crystals for cloudbusters)

HHGS are available from www.powerpyramids.com/
=========================================

> > (which are not real CB)

> They are CHEM-BUSTERS so they are CBs. :-)

The term CB was already Reich's for an instrument that draws Orgone energy in and was called a CloudBuster (CB) by Reich. See such in book by Reich "Contact with Space" Core Pilot Press Rangeley Maine 1957. Don's misuse of the term is admitted by him but never the less he is using it to get attention of the affiliation with Reich's machine or device and it distorts
the true use and meaning of the device.

> > that is why I referred to http://www.orgone.org because they show the real
> > CBs they do not sell them Don Croft does not refer you to the books by
> > Wilhelm Reich that tell about the how to build real CBs.

> Because to use Wilhelm Riechs CloudBusters ARE DANGEROUS for the unskilled where as
> Dons are of a different designed (an extension on his research if you would) and are safe for all to use.
> There are links all over the 2 sites now even to your own site about
> other places to read about Orgone. If anyone wants to buy books they
> can come to your site and buy them their.

A false claim of yours....PORE does not sell WR books. We refer people to the publishers such as the Wilhelm Reich Museum. Check the PORE site before you speak the claims you do. Please do. Yes the Croft CB may be safer but not necessarily safe. I have not seen a link you mention from Don's or the meta..site to PORE. Show me where it is please. Yes Reich's CB is dangerous unless used properly but now everyone will think Don CB and Reich CB are the same when they are not. DIstortion of truth

> > or how to use them as by the inventor. A real CB
> > does not shoot out orgone...A real one draws it in and must be grounded to
> > moving water.

> You are absolutely right Dons CB doesn't SHOOT it out either it draws it
> in and converts the bad/negative orgone (DOR) to positive Orgone (OR) so
> there is no bad by product (DOR) that must be drawn away by the ground
> water. It then pass the good orgone (OR) back to the environment.

> > What is grounded to water in a DON Croft thing...Nothing.

> No need for it!

He may claim it draws but it is the same set up as Reich's orgone shooter. The Croft does not draw it shoots. And I have tried a Don Croft device and it shoots orgone but very little and not enough to even do anything as far away as con trails.... An orgone shooter has an accumulator attached. Don's has his form of an orgonite material (epoxy and metal beads) at one end and tubes open at the other end (it is an orgone shooter nothing more). The Reich CB does not draw DOR. Dor is dead orgone in an area. It is proded with the Reich CB back to pulsating Orgone. The water attracts orgone to it but if you read Reich's work on this you would know this. Orgone is drawn to water.

> > He created a whole new twist on it.

> Yes you are right he has moved forward and produced some new results on
> Wilhelm Riechs research. That's innovation.

Only the material in the end of the tube for an accumulator was new. Not much innovation either since Karl Welz came up with the orgonite material long before Croft. I saw same material used in a pyramid accumulator in Nevada in 1974. It is not new. There is no new results on research by Croft because he has done no scientific research. No Data, no results. Reich did give results and data. Thats another difference between them. Croft is an idea person but not a researcher or scientist. He admitts this as well and I commend him for being honest about that. The problem is that followers of Croft think he is some scientist and a reearcher when he is not. BTW Reich's name is not "Riech"

> > Now that the Chemtrail fraud conspiracy of his was not enough he is now after the towers.
> > There is no proof for the chemtrail but if you read any meteorological text
> > book you will find the contrails are a result of condensed moisture from
> > jet exhaust and not from chemicals of some alien plot.

> Con trails are exactly what you described BUT how long does a stream of
> condensed moisture (Con Trail) stay in the air before it dissipates?
> >From what I've heard (I'm in Australia) these CHEM trails stay around
> for the rest of the day and don't' dissipate they just spread.

Yes CONtrails do stay for hours to days......see above where I explained them..
They are not chemtrails ....chemtrails are a scam for those paranoid about such things and then you have a false conspiracy created... Not much proof or data on them.

> > And now there is a another plot by a government on cell phone towers to control; our
> > minds.....GIVE ME A BREAK

> I'm not sure if it exists or not but the technology to do this CERTIANLY
> does exist SO can you prove that there isn't ANYthing in it.

Now you are turning the proof around from you to me again without proving your statement... You need to prove there is something there first.

> Anyway as well all know DOR IS produced by these and the (Tower Busters)
> simply convert the DOR to OR. I don't know about you BUT I think this
> is a good thing. :-)

There is no proof that DOR is turned to orgone by these devices yet. I have not seen any. Its only like a infomercial with no scientific proof. A lot of hearsay etc. but no proof. Yes it is a good idea if it works. But maybe with so many thrown everywhere you could overexcite orgone and create the Dor you are trying to get rid of. What about the pollution of these things being thrown all over. More research should be done on effects before everyone making them and affecting the environment.

> > I guess there is a sucker born every minute
> > I hope many of you are not sucked in but do as you must with your time and
> > money.

> So you are saying that all the people around the world that are using
> this technology or offshoots of it are all WRONG. AND that YOU are right.

Hearsay is not proof. I spoke only to what Don Croft is selling not about other offshoots. Try some science... It is not a matter of right vs wrong. It is science=knowledge, data, research, results, and conclusions. Repeatable tests too.....

> > Maybe you will also buy his bugzapper to kill bacteria in the body that is
> > not proven either but it all makes money for Don Croft and publicity Steph etc....

> Zappers have been around for YEARS and again a LOT of people use them
> and get good results. ARE you also saying that THEY are wrong as well.

Again it is not right or wrong. The point is zappers are unproven. Placebos do work on 40% of population. Do you take a new medicine before it has been tested? What long term effects do electical stimulation do to your health? Power of suggestion is very strong. There has not been a population study of the Zapper effects but if there is please show me and others on this list. You say they have been around for YEARS. How many years? Who in science community have tested them. Who in medical fields have tested them? Where are the results and data? Maybe you or Don start should selling them for improved memory too? That can be a good scam too. People will believe most anything these days it seems.

> Don does sell his own version of them.
> How is Don allowed to make money to live? In your view?
> How do you make Money to live?

Hey I work like most. Its none of your business but I will share it. And what do you do for work? I Have been a teacher and I am a boat builder. I do not prey on less informed to make money on things they will buy from fear of something else happening. Don can work too instead of scamming people out of money for devices they buy as a result from the infomercials he writes about the fears bacterias, chemtrails, mind control, and cell towers. All of which are unproven to be a real enough fear to use the devices he has.

> > Enough said and here is a direct link to CB page at PORE
> > http://www.orgone.org/requipment/cbuster/cbust00.htm

> Thanks I'll add that to my readings it's always a good idea to get a well rounded view from ALL sides.
> Isn't it a bit irresponsible to let untrained people build the Original
> CloudBuster when it is so dangerous if not used properly?


Reich published the materials on the CB. Yes they can be dangerous. I am sure that a chem buster can be dangerous if misused and pointed at people. Anything can be dangerous if misused. You can even kill yourself if you drink too much water over a long period of time. A child just died of this in the states due to parents forcing water into her. Very sick society we
live in.

> Again you've added a whole heap more slander BUT you haven't said WHY
> you say that Dons CB isn't supposed to work???

What slander////???? Please quote what is slander..?? Also look up the
meaning of the word please.


> ALSO before you start on me. I am not making ANY money from ORGONE
> devices at all. NORE am I related or in direct contact with DON! I just
> hate it when people make unsupported accusations against other people
> that are trying to help the world.

If you hate it so much then why are you doing it to me and PORE?
I haven't made any money from PORE it is has been a loss since I started it.


*****************************************************
*******************************************************************
And for GaleWildAngel@aol.com

> Well, everyone has a choice in life and you give no other choice than PORE.
> That to me is NOT the American way at all, to me that is the corporations ways.

No there you go putting words into my mouth I did not say. I did not give no other choice than PORE. You are engaging in Adhominem attacks. PORE does give many choices of other groups and orgone sites to visit. Its non profit and not a corp.
http://www.orgone.org/orgongps00.htm


> Don does give instructions to his CB's which everyone is improving. He
> doesn't corner the market on anything. You can go to the forum and see, they
> have instructions of how to build your own. You don't have to buy anything
> from Don Croft. And you know, over time everything changes. Reich's devices
> should be improved because our technology today is so much further advanced.
> I would sure hope we weren't stop back in time.

I agree he gives plans away for chembuster as I do for orgone accumulators and pillows etc. but I also say he is using a scam chemtrails to get people to make things that he does derive money from as links to zappers etc. See the truth about contrails above and this link. Technology has changed but not much in orgone research as you might think. Yes improvements would be good but distortions and misnaming devices helps nothing.
http://cimss.ssec.wisc.edu/wxwise/contrail.html
and
http://www.borderlands.com/contrails/contrail.htm
http://users.erols.com/igoddard/contrail.htm

I do not blame Don Croft entirely for the conspiracy about chemtrails. The conspiracy goes crazy with others on the web. He just uses it with a twist of falseness about what contrails really are to get more attention to his endeavors. The false definition of contrails by these folks only feeds the belief in chemtrails. They think if a jet trail stays for more than a few minutes it must be a chemtrail and not a contrail. That is false. That is part of the scam to get others to believe. Contrails can stay in the sky for a long time and have been around since jets in the 1940s.

> And the proof is in the pudding. I have the devices and I have seen first
> hand what these devices do. You can make your own. The TB's 50 of them will
> run $25.00 for a gallon of resin, you can use any funky (or not clear)
> crystal in the top of it and scrape metals from a machine shop.

The proof in in scientific studies, controls, data etc.
The proof is not in a pudding. Show the studies.
What lab analysis of the TB has been done??
A belief that something happens is not enough.

> So please keep your rude comments to yourself there is really no need for
> that. Each and everyone here has choices to make. Going to their inner self
> and knowing what is in their heart is where it's at. It's not you saying,
> "PORE" is the best. Who knows? You give me know proof either.....where is
> your pudding?
>
> I am telling first hand experiences, I haven't heard yours yet. Please do
> tell.

I do not make rude comments. This is just another adhominem attacks on me by you. I ask questions and state facts of con vs chem. You also now reverse the proof to me without the proof of yourself. I did not say PORE is the best. But please quote where you saw that. As for Chembuster vs cloudbuster. Yes I have tried both. I have done CB that's real cloudbuster work in the 70s. We also had shooters but they had no effect on weather. They do work well on improving healing of bruises, cuts, and burns. You probably want proof. I can only point you to Reich's work on this for now. "Cancer Biopathy" by Reich 1940s. He did the studies and had tests done on patients at hospital in Portland Maine in the 1940s. Yes I have used CB and Chembuster but what I see for action of the CB and for the lack of action of the ChemB is not proof. A scientific study must be done. But no one seems to do it. Its only testimonials like an infomercial to sell something. Don Croft has done no scientific studies. Its only testimonial stuff.

Its not the proof from me to show it does not work that is needed. I am not selling and idea to others of something TO BUILD to get rid of unproven chemtrails. Don Croft and you folks are. WHAT YOU HAVE HERE IS REVERSE LOGIC. What you say about it you expect others to take as truth and evidence and you want others to prove it doesn't work when it has never been proven to work in the first place. And actually there is no logic to the way you expect others to prove it wrong when it was never proven to work.

You write the same falseness about con trails:

> And no Chemtrails and Contrails are very different things. Contrails last
> only a few seconds in the sky. Chemtrails will spread out over time and
> sometimes on a bright clear day there will be a whiteout. Please explain
> that for me. I have once again, see that with my own eyes and so have my
> kids and many others have seen that also.

Sure you see it but that is what contrails do. They do what you think only chemtrails do because you believe what Don Croft wrote and others wrote about chemtrails. Yes I have shown with links to sites that do give the real facts about contrails. It is fundamental knowledge of meteorology. Have you studied this science? Have you looked up information on the web about CONTRAILS. Its not hard to find, yet you repeat the falseness that contrails can only last a few minutes. They last anywhere from a few seconds to over a day. They spread out too. They are a weather predictor as well.

> I am not trying to step on your toes....but I know the people on this forum
> are smart enough to know that PORE isn't the only source for ORGONE. Since
> it is free energy. So please don't make them sounds as if they are, because
> I for one know they are not.

You sound just like the other person John Morrison about PORE. I never said it was the only source for orgone. In fact it is easy to see that PORE has links to many web sites about orgone. You have put false words into my mouth. Please quote where I said "it is the only source". PORE is not what is the subject here, you are sidetracking from the subject. I am writing to you here ; PORE is not. I contend that The TB and CB and HHG are only scams and are using false situations to get there product build and spread around. Don Croft is making money from this as direct or indirect to zapper and other materials he sells. by Don Croft
http://www.worldwithoutparasites.org advertised on
http://www.metatech.org/cloudbuster_&_orgone_generator.html
and now this http://www.metatech.org/danger_of_cell_phone_tower.html

And of course the main site of Don and Steph does so much more conspiracy and fear to buy and do things. It's a winning formular to sell stuff from fear. http://www.metatech.org/

> Life is so much better with these ORGONE devices around. I love mine and yes
> we are taking care of the towers. Atleast we are doing something. What are
> you doing to help mankind? Do you answer questions of the people on the
> forum?

And again a sidetrack from the discussion and use of questions to insinuate an adhominem attack on my character. I have posted to the chemtrail,CB etc forum only to be censored and not allowed to post anymore. PORE and I do offer mega information about orgone that others do not give out except for a charge of money. Yes I do answer questions on a forum which may not be "the forum" you refer to. I answer 100s of questions at PORE and on the OML (forum run since 1995 via PORE). I do not participate in Chemtrail forum or cloud-busting one anymore due to censored. I am a member but have little interest in the discussion based on false definitions of contrails.

And just to set some of the record straight Don Croft did use Karl Welz idea of orgonite and the CB he uses Reich's name for it as well as Chembuster , yet it does the reverse of the real CB. If he just called it a chembuster that would be one thing but what he does is add to the disinformation about Reich's work and the real Cloud Buster. I try to set the record straight.

=========== certainly could use some spelling but the point below is easily read

......from.... http://educate-yourself.org/ct/goodbyects10jan02.shtml
So Don visited Karl's web site (http://www.orgone.net) and found that Karl had developed a small, but powerful orgone generator ("orgen"). An orgen generates the positive form of orgone ("OR") and neutralizes the deadly form ("DOR").
Orgone accumulators, on the other hand, can accumulate both the positive and deadly DOR form of orgone. Orgone accumulators have traditionally been abbreviated "oracs" and Don sometimes uses that term himself, but Don's modified version of a Cloudbuster employs the "orgen" ideas of Karl Welz, and not an orogne accumulator. The marrying of Welz's
orgone generator and Reich's Cloudbuster has resulted in a new instrument, with new and different attributes. It's more appropo to call it a "Chembuster" to distinguish it from Reich's Cloudbuster and avoid misunderstandings among Reichian Cloudbuster afionados (or pedagogues). The orgone generator portion of Don's hybrid devices consists of metal shavings, magnets, crystals, and sometimes Mobius or spiral coils that are rigidly held in place by epoxy or polyester resin. With psychic inisights gained form his wife Carol, and a little help from dowsing, Don put together a smaller cone shaped orgone generator using the above mentioned materials (and a plastic funnels for the mold) and called it a "Holy Handgrenade" (HHg)
(http://educate-yourself.org/dc/HHGconstruction10jan02.shtml). A number of people have reported unusual and positive effects produced by a HHg, even from a considerable distance. Don also incorporated the orgone generator into the "Terminator" , his latest hybrid modification of a low frequency bioelectric 'zapper' that has also generatred some "unusual" reports of its own. (http://educate-yourself.org/dc/dcdonszapperandterminator24mar02.shtml )
===================================================

And below Croft seems to be given credit for a unique design... I say it is only a Welz device made large. I have one of those devices of Welz and still find it ineffective.

===================================================
.......cont...from previous ....Since he already was thinking about using the Cloudbuster to try and break up chemtrails, Don took it a step further and combined a large version of his HHg with a Cloudbuster utilizing rigid copper pipes and a 2 gallon plastic bucket to hold the whole enchilada together. This modification of Reich's Cloudbuster into a Chembuster is a unique and original prototype by Don & Carol Croft and produces some rather 'unique' effects.
==========================

I have seen images at http://educate-yourself.org/dc/dcricks10minctclearingjob.shtml  The camera is in different places. Questions.. What was a satelite image showing. One image is of late day golden. later picture is of noontime. Doesn't add up. What about a video sequence with camera same direction and a time counter. This is included in the following about cloud busting Reich style http://www.orgone.org/articles/ax9kelley1a.htm

They (the images from LA) do not even seem like images of the time period in question and when you deal with proof of CB by Reich or by Croft it becomes impossible to scientifically prove with use with weather. The variables change and are rarely the same conditions to repeat the experiment. Weather is too variable to have same exact conditions. Lab work with an orgone shooter (what a chembuster is) is where experiments should be done. And one can do experiments using DOR buster a mini Cloudbuster Reich made to use on patients to draw off energy from the body. Dor buster is grounded into water like the real cloudbuster designed by reich. The orgone shooter is all Croft has made with the addition of Welz's orgonite for a new version of orgone accumulation.


below... I wonder if the African situation of downpours may have happened as a result of a combination of Demeo cloudbusting in Namibia. I do not have date to correlate. Demeo has been there several times and anyway Demeo's cloudbuster was in africa long before any Croft thing was. Another non truth about Croft. See statement below Croft CB was first in Africa.....not true.     See Demeo 1992-6+ in Namibia http://www.orgonelab.org/research.htm
   ////Additional desert-greening work has been undertaken by Dr. DeMeo in
.......and Namibia, Africa (1992-93). In one of the most important and
ambitious applications of Reich's discovery so far undertaken, with the
participation of workers from Italy, Eritrea, Germany and the USA, Dr.
DeMeo directed a series of five separate desert-greening field expeditions
in the arid Horn of Africa, from 1994 through 1999. ////

And see this on Croft Cautionary Open Letter on the Croft Chembuster.
by Demeo.. http://www.orgonelab.org/chembusters.htm

======================
http://educate-yourself.org/ct/africasfirstcloudbusterjun01.shtml

Don had contacted me by E mail last year and was sending me reports of his success with the Chembuster both in this country and abroad. He had sent the instructions to an African man named Gert Botha living in Namibia who built a modified version of the device using locally scavenged materials (read "Africa's First Cloudsbuster " {http://educate-yourself.org/ct/africasfirstcloudbusterjun01.shtml}

Initially, Gert found that his Chembuster was having an effect on the incessant sand storms, causing them to constantly change direction, but eventually he found that aiming the Chembuster south at an angle of 30 degrees to the horizon forced the sandstorms to stop. After being parked in this position for two months, his Chembuster brought on torrential rains for the first time in many dry months to one of the driest regions of
Africa.
=========================================================

regards......jogg




And here is the attitude of Don Croft to answer questions about it.
=========================
posted 10-04-2001 07:37 PM
I'm Don Croft, the stranger that some on your list have seen fit to castigate. I'm writing this to them and to people who consider their diatribe worthwhile to read. First, let me say that I already have more zapper business than I can handle and I'm not looking for more. We sell mostly to distributors now. I prefer not to do business with people who aren't looking for them in the first place.
=====================
posted 10-08-2001 08:25 PM
Don, have you done any controlled studies on the effectiveness of the cloudbuster? Like using it and not using it at randomized time intervals and having several noninteracting "blinded" observers log the results (or lack of results) which they observe?
=====================
posted 10-09-2001 12:33 PM
Dear chemtrail newsgroup participants--this is Don Croft. My wife, Carol,and I came up with the configuration for the basic cloudbuster described on www.metatech.org. We want to discuss this with anyone at all who has taken the steps to build one. Otherwise, we just don't have the time and energy for discussing it and we certainly don't feel obliged to justify it to anyone. Anyone who makes one is on equal footing with us as far as 'credentials' go, and the concepts are just too new and different for anyone who hasn't tried it to understand, let alone judge. An egroup will be set up soon, which address will be on www.metatech.org. Anyone may read the comments there, but in order to contribute, we are asking that one first make a cloudbuster according to our parameters, which are clearly laid out on that site.
======================
posted 10-09-2001 12:45 PM

Dear Mr. Croft:
I don't believe anyone on this board has 'castigated' you, nor do I consider any of our accusations as 'infantile'. Several of us have doubted the efficacy of your products; one has asked if any studies were performed. I hardly consider those questions to be uncalled for. You make some extreme claims for a device that operates on principles with which none of us are familiar. I think it is not surprising that some of want -- at the very least -- some data or comments as to the results of this device's operation.

Regards,
Duncan Kunz / duncankunz@home.com
Mesa AZ / 480-891-2525

==========================
no answer given?????

===============================

http://www.cnn.com/2002/TECH/science/08/07/contrails.climate/index.html

9/11 study: Air traffic affects climate

August 7, 2002 Posted: 5:00 PM EDT (2100 GMT)

By Richard Stenger

(CNN) -- The thin wisps of condensation that trail jet airliners have a significant influence on the climate, according to scientists who studied U.S. skies during a rare interruption in national air traffic after the September 11 terrorist attacks.

During the three-day commercial flight hiatus, when the artificial clouds known as contrails all but disappeared, the variations in high and low temperatures increased by 1.1 degrees Celsius (2 degrees Fahrenheit) each day, said meteorological researchers.

While the temperature range is significant, whether the jet clouds have a net effect on global warming remains unknown.

"I think what we've shown are that contrails are capable of affecting temperatures," said lead scientist David Travis of the University of Wisconsin, Whitewater. "Which direction, in terms of net heating or cooling, is still up in the air."

Contrails Explainer: * Long white wisps of artificial clouds high in the atmosphere, contrails are the condensation trails left behind by jet airplanes. * Similar to human exhalation making a fog in chilly weather, contrails form when warm humid engine exhaust meets extremely cool air in the atmosphere. * Air temperatures where contrails form are generally lower than minus 40 degrees Fahrenheit (minus 40 degrees Celsius). * Like natural cirrus clouds, contrails insulate the planet, blocking out incoming solar energy from above and keeping in heat down below. * Scientists estimate that contrails cover some 0.1 percent of the Earth's overall surface, with regional concentrations as high as 20 percent.

In many ways, contrails behave in the same manner as cirrus clouds, thin high-altitude floaters that block out solar energy from above and trap in heat below.

As a result, they help reduce the daily range in daytime highs and nighttime lows. Contrails, by providing additional insulation, further reduce the variability.

With air traffic growing and contrails becoming more prevalent, the natural variation will further decline and could disrupt regional ecosystems, some scientists speculate.

Certain trees, crops and insect species depend on specific daily temperature variations for their survival.

In some ways, contrails differ from their natural brethren. Cirrus clouds let less heat out than in overall, producing a net increase in the Earth's temperatures, according to climate scientists. With contrail clouds, they said they are not so sure.

"Contrails are denser and block sunlight much more than natural cirrus clouds," said Travis, who with colleagues reported the findings this week in the journal Nature.

"And contrails are much more prevalent when the sun is out," he said. "When this is factored in, there is a possibility that they offset global warming, and this is what we are trying to determine now."

The researchers plan more studies to tackle that question, but they said they expect to rely on circumstantial evidence only.

"We can only hope that the September 11 tragedy never happens again," Travis said.

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