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More or Less Dioxin??? (was Re: Dioxin Sources
Food for thought: PVC production has almost tripled in the last
fifteen years. Yet, dioxin exposure has dropped by over 75% in the
last decade; I am talking the total biologically available as a
function of TEQ. Seems to me that if the PVC industry was the smoking
The reports on dioxin exposure are independent university research efforts or
government studies (US and Europe), *not* from the PVC industry.
aside from phillip's response questioning the 75% drop in exposure; as to
pvc sources contribution we need to look at a more complete picture than
what gp has managed to extract from that industry. pcdd/f attributable to
pvc come from the complete life cycle, not just the pcdd/f produced at the
pvc & edc plants. and since pvc production skyrocketed only recently, how
much of the increase has gone through its life cycle and been incinerated?
also, a certain fraction of pcdd/f created at production will not
contribute to exposure for a long time (ie that portion landfilled, as
opposed to incinerated or placed into surface waters).
back to the broader question of overall exposure trends: there is very
little known , actually, given the immensity of the data gathering task!
thomas & spiro, who head up epa's emissions inventory effort and who
published a summary of that work, conclude, if i recall, that the well
known emissions gap (ie not enough known sources to account for observed
env. & biologic loads) largely disappears w/ certain assumptions. i wonder
to what degree the life cycle of pvc i included in either scenario?
in any case, my personal beliefs depend on what's known about the
mechanisms of action, the hormonal pathways, that tell us that a 75%
reduction, if true, probably doe not help. in fact, it may hurt, given
that we react more strrongly to smaller doses of hormones than to larger
ones, in many known instances (guilette, vom saal, others). in short, it
seems likely we really have had enough already.
one other comment, in response to:
"Rebecca Leighton Katers" <firstname.lastname@example.org>:
>I agree with Mr. Sagady that citizen activists should not waste
>time dwelling on their "victimhood," but I don't
>agree with the implication that this
>victimization is imaginary or insignificant.
as alex responded, he was not saying that victimization is an unimportant
issue. he was actually focusing on tactics to aid victims; how to make
such time more productive than unadulterated complaining about the
unfairness of the system confronting us. his record of aiding us with
extraordinarily useful information is clear.
i've been assuming gp is comfortable with its own explicit decription of
its methodology in its several year effort at gathering data from edc & pvc
production facilities! i would have liked to see some of the data sam
asked for, but gp's recent reports on this data collection enough level of
detail to validate to me gp's claims about why the industry was delaying on
making such data public. their description of the rigo et al. reports
methodology, and gp's detailed description of the industry's lies in using
that report in policy decisions and in public, make me even more
comfortable w/ gp's efforts here.