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From: Don Klipstein on 5 Apr 2010 12:44
In <5c86eb8a-57c3-44e9-80aa-db534fda09e4(a)y14g2000yqm.googlegroups.com>,
TibetanMonkey, Originator of the Banana Kung-Fu wrote in part:

>>article, "Boundaries for a Healthy Planet," he argues that while
>climate change gets ample attention, species loss and nitrogen
>pollution exceed safe limits by greater degrees. In addition, other
>environmental processes such as ocean acidification and stratospheric
>ozone depletion are also moving toward dangerous thresholds.'
>
>http://scienceblogs.com/illconsidered/2010/04/is_earth_past_the_tipping_
>poin.php

Stratospheric ozone depletion, as it turns out, is looking to me like a
disaster averted by nearly eliminating production of CFCs and nearly
eliminating release into the atmosphere of CFCs and halogenated
hydrocarbons in general.

Gas/Vapor 1998 Concentration 2009 Concentration
------------------------------------------------------------------------
CFC-12 269 ppt 242-244 ppt (down 9.3%)
CFC-11 533 ppt 536-538 ppt (up .75%)
CFC-113 84 ppt 76-77 ppt (down 8.9%)
carbon tetrachloride 102 ppt 88-89 ppt (down 13%)

Hydrochlorofluorocarbons are still increasing, with HCFC-22 being the
main one, but they are less damaging than the CFCs that they replaced.

http://en.wikipedia.org/wiki/Greenhouse_gases

http://cdiac.esd.ornl.gov/pns/current_ghg.html

One thing interesting about the second link: Total anthropogenic
radiative forcing (change in radiation balance assuming constant surface
temperature since before the Industrial Revolution), from listed
greenhouse gases, as of 2009 was 2.98 watts per square centimeter. CO2
was responsible for 1.66 of that in 2009 and 1.46 of that in 1998. The
four chlorine compounds that I mentioned above accounted for .269 W/m^2 in
2009 and .28 W/cm^2 in 1998.

The above 4 plus HCFC-22 accounted for .31 W/cm^2 in 1998 and .302
W/cm^2 in 2009.

For that mater, total anthropogenic ozone depleting gas EECI is down 10%
from its peak in 1994 and still declining:

http://en.wikipedia.org/wiki/File:Ozone_cfc_trends.png

Not that radiative forcing is the mechanism for statospheric ozone
destruction, but stratospheric ozone presence has stabilized both where it
is most-monitored (in the Antarctic) and in a larger global measure:

http://en.wikipedia.org/wiki/File:Min_ozone.jpg

http://en.wikipedia.org/wiki/File:TOMS_Global_Ozone_65N-65S.png

http://ozonewatch.gsfc.nasa.gov/ozone_maps/movies/OZONE_D1979-10%25P1Y_
G%5e360X240.LSH.mpg
(Animation of how the month of October fared from year to year, which I
selected because October is a bad month for Antarctic stratospheric ozone)

http://ozonewatch.gsfc.nasa.gov/monthly/climatology_10.html

(If one needs a different version of the animation)

- Don Klipstein (don(a)misty.com)
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