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  #21  
Old 22.02.2020, 17:16
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Re: Jet trails in the sky

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i prefer to call them jet trails. I agree its unlikely to be chem. but it sure reduces the sun over zurich sometimes.
I'd be interested to know if the effect is even measurable.
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  #22  
Old 22.02.2020, 17:17
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Re: Jet trails in the sky

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I'd be interested to know if the effect is even measurable.
Of course its measurable and quiet easily
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  #23  
Old 22.02.2020, 17:32
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Re: Jet trails in the sky

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Glad to be too poor to fly.
Wrong thinking. Sitting in a plane is the only way to avoid their jet trails and/or their poo.

oh - and to be able to join the mile-high club of course.
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  #24  
Old 22.02.2020, 17:37
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Re: Jet trails in the sky

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I'd be interested to know if the effect is even measurable.


https://www.nbcnews.com/mach/science...et-ncna1034521
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  #25  
Old 22.02.2020, 19:00
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Re: Jet trails in the sky

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Chemtrails have been debunked a thousand times. It's just condensed water vapor. But it does have a impact on climate https://en.m.wikipedia.org/wiki/Cont...ls_and_climate

The only thing that can be done is to fly less.
Not really Greta.

https://www.popularmechanics.com/sci...limate-change/

A new study suggests that a few small tweaks could greatly reduce how much airplanes affect the climate via contrails. By raising the altitude of certain flights by just 2,000 feet, scientists say we could reduce climate-affective airplane exhaust by almost 60 percent. These flights would be shifted just outside the altitude range where contrails are able to form.
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  #26  
Old 22.02.2020, 19:14
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Re: Jet trails in the sky

Pootrails are the real menace. Clenching until you land will take 0.4C off the total temperature rise by 2050.
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  #27  
Old 22.02.2020, 19:15
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Re: Jet trails in the sky

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Not really Greta.

https://www.popularmechanics.com/sci...limate-change/

A new study suggests that a few small tweaks could greatly reduce how much airplanes affect the climate via contrails. By raising the altitude of certain flights by just 2,000 feet, scientists say we could reduce climate-affective airplane exhaust by almost 60 percent. These flights would be shifted just outside the altitude range where contrails are able to form.
when the atmospheric air is dry then they dont appear or disappear very quickly.
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  #28  
Old 22.02.2020, 20:12
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Re: Jet trails in the sky

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Its obvious pollution if its chemicals they realease.
It isn't.
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And if its not chemicals and just hot air then it makes artificial clouds. Clouds stop the sun getting through.
That's good. So reduces globally warming.

I think we need more planes.
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  #29  
Old 22.02.2020, 20:44
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Re: Jet trails in the sky

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Pootrails are the real menace. Clenching until you land will take 0.4C off the total temperature rise by 2050.
Not only. You will feel warmer if you clench I bet. Rising the altitude by 2000ft is will make the cabin colder. Siberia.

Simples.
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  #30  
Old 22.02.2020, 21:22
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Re: Jet trails in the sky

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Not only. You will feel warmer if you clench I bet. Rising the altitude by 2000ft is will make the cabin colder. Siberia.

Simples.
Corking idea 😊
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  #31  
Old 01.03.2020, 08:14
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Re: Jet trails in the sky

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So many jet trails over Zurich that they block out alot of the suns rays. Can't be good for the environment! They should be forced to cool these exhaust gases before they leave the engine.. The only reason for the trails is the hot exhaust mixing with cold moist air.

https://www.theguardian.com/environm...n-off-the-hook

Ban chem trails! And whether you think its chemicals or harmless water vapor the point is that its pollution/ damage to environment

Attachment 138739
Trolling, or just lack of understanding.

The water vapour is always there, the planes just bring it together for a little reunion ... completely harmless.
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  #32  
Old 01.03.2020, 08:33
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Re: Jet trails in the sky

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Trolling, or just lack of understanding.

The water vapour is always there, the planes just bring it together for a little reunion ... completely harmless.
Not trolling and I am well aware that its nothing more than harmless water vapour. ( of course that is not 100% sure )

Water vapor spreads out to make clouds and THAT does affect the environment.
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  #33  
Old 01.03.2020, 08:47
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Re: Jet trails in the sky

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Trolling, or just lack of understanding.

The water vapour is always there, the planes just bring it together for a little reunion ... completely harmless.
Science says water vapour trails caused by planes have an impact on global warming https://www.sciencemag.org/news/2019...global-warming and https://www.nbcnews.com/mach/science...et-ncna1034521
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  #34  
Old 01.03.2020, 08:50
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Re: Jet trails in the sky

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Science says water vapour trails caused by planes have an impact on global warming https://www.sciencemag.org/news/2019...global-warming and https://www.nbcnews.com/mach/science...et-ncna1034521

Jet engine exhaust contains carbon dioxide, oxides of sulfur and nitrogen, unburned fuel, soot and metal particles, as well as water vapor. The soot provides condensation sites for the water vapor. Any particles present in the air provide additional sites. Only the IGNORANT say its harmless
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  #35  
Old 01.03.2020, 09:20
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Re: Jet trails in the sky

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Science says water vapour trails caused by planes have an impact on global warming https://www.sciencemag.org/news/2019...global-warming and https://www.nbcnews.com/mach/science...et-ncna1034521

Any proof that they may also have an affect through sunglasses?
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  #36  
Old 01.03.2020, 10:18
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Re: Jet trails in the sky

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Any proof that they may also have an affect through sunglasses?
No. But keep them on, against cataracts. Plus rule no.1 for the Americans, always keep sunglasses on. And chew gum, no. 2.
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  #37  
Old 01.03.2020, 21:21
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Re: Jet trails in the sky

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Jet engine exhaust contains carbon dioxide, oxides of sulfur and nitrogen, unburned fuel, soot and metal particles, as well as water vapor. The soot provides condensation sites for the water vapor. Any particles present in the air provide additional sites. Only the IGNORANT say its harmless
The contrails are no more harmful than any other clouds which form with the same percentage of ice crystals, and there are many which do form naturally.

By far the majority of the material in the contrails is simply water vapour from the atmosphere - the plane's exhaust has simply gathered it. This can be reduced by simply flying at a lower altitude, and only a small minority of planes actually fly high enough to form contrails.

Also, while it has an effect, it is insignificant compared to CO2 production. From one of the articles somebody else quoted in this thread:

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Andrew Gettelman, a cloud physicist with the National Center for Atmospheric Research in Boulder, Colorado, says contrail cirrus clouds are a complex problem, but that their warming effect is still small compared with the overall amounts of CO2 belched by society. “If all we had were contrails, there wouldn't be global warming.”
The other elements of the exhaust are pollutants which have other effects, but should never be confused with the effects of contrails - which are negligible compared to everything else we're doing to destroy the environment.
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