On Fri, 21 Sep 2012 14:08:41 +0100, John Williamson
wrote:

Steve Firth wrote:
"Doctor Drivel" wrote:
"Steve Firth" wrote in message
...
Andy Champ wrote:

CO2 most definitely is toxic.
No, not in the slightest.

(Not very toxic, you can take a few
percent).
It's not toxic at all.
Thicko, it is toxic to the atmosphere.
Not even that you lame brained disappointment to your parents.
The American Heritage® Dictionary of the English Language, Fourth
Edition copyright ©2000 by Houghton Mifflin Company. Updated in 2009.
Published by Houghton Mifflin Company. All rights reserved.
toxic [ˈtɒksɪk]
adj
1. of, relating to, or caused by a toxin or poison; poisonous
2. (Medicine / Pathology) harmful or deadly
[from medical Latin toxicus, from Latin toxicum poison, from Greek
toxikon (pharmakon) (poison) used on arrows, from toxon arrow]

(Definition 2) CO2 is harmful or deadly to most animal life when
concentration in the breathing gas is excessive. Therefore, it is toxic.
Admittedly, not as toxic as a lot of other gases, including carbon
monoxide, but still toxic.


This sums up as I see it:

"Carbon dioxide is a toxic gas which is odourless and colourless. Rising
levels of carbon dioxide affect the human body, but what level is
dangerous and how do you know you are suffering from carbon Dioxide
poisoning?

Carbon dioxide is 'not just an asphyxiant'."

http://www.analox.net/carbon-dioxide-dangers.php

--
Rod