CO2 is not a deadly gas. It just doesn't support combustion is all. Plants
do just fine with it. A more important point to make, however, is that life
on earth did not evolve in an oxygen atmosphere. What we have today is
earth's secondary atmosphere. The original was a great deal more like
Jupiter's is today.

RM

"BenignVanilla" <BenignVanilla@tibetanbeefgarden.com> wrote in message
news:bf94qj$cckqq$1@ID-152254.news.uni-berlin.de...
>
> "G=EMC^2 Glazier" <herbertglazier@webtv.net> wrote in message
> news:18918-3F17F9D5-96@storefull-2356.public.lawson.webtv.net...
> >     I read that if the earth(rock planet) had the mass of Jupiter than
> > man would have great evolutionary changes,such as walking on all
> > fours,very short and heavy bone structures etc.      I say he would
> > never have evolved in the first place.The reason is this.  The great
> > gravity force would not let hydrogen,and helium escape its atmosphere.
> > Helium would not be any problem. Hydrogen is a different story. It
> > combines very easy with oxygen,andCO2 is a deadly gas.   Well I posted
> > this to show how important the right amount of gravity is. The exactly
> > right force of gravity created an organic universe,and the right force
> > of gravity created man.   Its gravity all the way.          Bert
>
> How about if we evolved to breath H?
>
> BV.
>
>