Re: [Phys-l] [tap-l] Fwd: [PHYSHARE] Can't win for losing - NF3

[John Hubisz <hubisz@mindspring.com>]

I believe that the best known greenhouse gas is H2O.  It is 100 times 
more abundant than CO2.  The molecule and its dimers and trimers have 
many ways to absorb IR, cutting out CO2's role in absorbing IR -  
because H2O has already absorbed it.  Except in some small regions of 
the IR spectrum where H2O does not absorb, does CO2 become a greenhouse 
gas.  Here, as the concentration of CO2 increases, each further increase 
in concentration produces less of a greenhouse effect than the previous 
because when radiation has been absorbed, it is not available to be 
absorbed further.

NF3 will have to fight hard.

John Hubisz


Bernard Cleyet wrote:
> Fwd'd by bc
>
> Seems a very stable non-biodegradable gas.
>
> Additional references:
>
> http://cat.inist.fr/?aModele=afficheN&cpsidt=17893800 
> <http://cat.inist.fr/?aModele=afficheN&cpsidt=17893800>
>
> http://www.agu.org/pubs/crossref/2006/2006GL026210.shtml
>
> bc
>
>
> Begin forwarded message:
>
> > *From: *Ian Ellis <ian@IGLOU.COM <mailto:ian@IGLOU.COM>>
> > *Date: *2008, July 03,  12:20:29 PDT
> > *To: *PHYSHARE@LISTS.PSU.EDU <mailto:PHYSHARE@LISTS.PSU.EDU>
> > *Subject: **[PHYSHARE] Can't win for losing - NF3*
> > *Reply-To: *Sharing resources for high school physics 
> > <PHYSHARE@lists.psu.edu <mailto:PHYSHARE@lists.psu.edu>>
> >
> > Attention-worthy, but note it is at present only one scientist's take 
> > on the dangers of NF3 (nitrogen trifluoride).
> > Read the whole story at
> > http://www.reghardware.co.uk/2008/07/03/nitrogen_trifluoride_tv/
> > Of course, both GB and the US are poised to obsolete pre-digital 
> > over-the-air TVs and create a huge demand for LCD replacements.
> >
> > Abbreviated quote follows:
> >
> > 'HD TV gas' 17,000 times worse for planet than CO2, claims boffin
> >
> > LCD TVs, praised as being greener than old-style tellies because they 
> > consume much less power, may actually be speeding climate change... 
> > atmospheric quantities of the gas Nitrogen Trifluoride (NF3) are 
> > booming. ... The chemical is used in the production of flat-panel 
> > displays which, in turn, are used to make today's TV screens....
> >
> > NF3 is 17,200 times better at trapping heat in the atmosphere over a 
> > hundred-year period than is carbon dioxide, the best known greenhouse 
> > gas....
> >
> > [A poster on the CHEMED-L pointed out this article.]
> >
> > -----
> > * Physhare FAQ/Homepage: <http://geocities.com/physhare>
> > * Physhare Archives and Subscription Management: 
> > <http://lists.psu.edu/archives/physhare.html>