Palmpilot said:
I don't know too much about O2 depletion, but I did find one article that estimates that oxygen levels have only decreased by 0.1%
of preindustrial levels.
http://blogcritics.org/scitech/article/atmospheric-oxygen-levels-fall-as-carbon/
Being exceedingly lazy, I'm going to copy and paste from a post I made to a Yahoo airship forum several years ago on not only the subject of oxygen depletion, but my opinion on global warming debates like this one.
-----------------
1d. Re: Oxygen tax
Posted by: "Jim Logajan" JamesL@... jimlogajan
Date: Sun Dec 9, 2007 12:40 pm ((PST))
paul denton wrote:
> [...] these are facts that are scientifically proven:
>
> 1. 30-40% OF THE WORLDS OXYGEN COMES FROM THE RAINFOREST.
I'm not sure if that number makes sense. Several years ago I was asked
by Bob Freitas (among others he asked) to review a paper of his titled
"Some Limits to Global Ecophagy by Biovorous Nanoreplicators, with
Public Policy Recommendations"[1]. In it, he determined that one could
burn the entire biosphere and consume only ~0.5% of atmospheric oxygen.
That is probably because the oxygen in the Earth's atmosphere is a
result of the action of cyanobacteria in the early history of the
earth.[2][3] Much of what was "reduced" is now buried in sedimentary
rock (just to be clear - this is not referring to fossil fuels.)
On the other hand, all I have is a lowly BSc in physics. I cannot claim
any certainty of knowledge with regard to global warming. I do not know
how anyone not trained in climatology, paleoclimatology, or even college
level physics can go about making claims one way or another on this
subject. Applied physics is a vast field and it isn't clear why some
people have no problem making authoritative claims or counter-arguments
on the subject but would probably couldn't debate General Relativity,
String Theory, or Quantum Electrodynamics if their life depended on it
-- unless they had web sites handy to grab "talking points" off of.
The level of math and/or experimental observation of those latter
subjects is probably comparable to that of climate modeling and
prediction. And yet many now claim expertise on climate models. Hmmm.
Jim
[1]
http://www.rfreitas.com/Nano/Ecophagy.htm
[2]
http://en.wikipedia.org/wiki/Cyanobacteria
[3]
http://en.wikipedia.org/wiki/Oxygen_Catastrophe