On Sep 27, 2:19 am, Martin Barr-David  wrote:
> Bonzo wrote:
> > "Lloyd"  wrote in message
> >news:1190820459.905976.152690@n39g2000hsh.googlegroups.com...
> > On Sep 25, 2:37 pm, Peter Franks  wrote:
> >> Lloyd wrote:
> >>> On Sep 24, 2:07 pm, Tunderbar  wrote:
> >>>>http://www.lavoisier.com.au/papers/articles/lav2006forWeb.pdf
> >>>> 1. Carbon dioxide is a pollutant
> >>> In substance not wanted is a pollutant.
> >>   pol·lut·ant (p...-l>t"nt) n. Something that pollutes,
> > especially a waste
> >> material that contaminates air, soil, or water.
> >> AHD, 3rd. ed.
>
> >> Plants want carbon dioxide, therefore, according to your
> > definition, it
> >> is not a pollutant.
>
> >> We want gasoline, but if gasoline spills in your river, it's a
> >> pollutant.
>
> > Gasoline is a manufactured product not essential for much of
> > anything, CO2 is a naturally occurring gas which is ESSENTIAL to
> > life on earth and therefore NOT a pollutant.
>
> But overdoses can kill- Hide quoted text -
>
Yes.  Water is essential to life, along with CO2.  Sodium is essential
to the human nervous system. But too much water in the wrong place
will kill people, and getting too much sodium in your diet can bring
on hypertension and heart disease.

With CO2 as well as many other naturally occurring substances in the
environment, what we need to see happen is the "Goldilocks
solution."

Not too hot, not too cold; not too hard, not too soft; not too big or
too small - but "just right."