This is part of an old item
originally posted on my old blog
Saturday 18 November
2006 I
will be picking
up the theme shortly in a new post...
[...old political commentary edited out,
you can read it if you really want here... and so
to
continue:]
The bottom line is still the bottom line. Gigatonnes of CO2 (et. al.)
dumped
into our
atmosphere.
There's one thing in all of this I find very interesting. Kinda technical,
so
bear with me while I try to explain. Everyone knows by now the shape of
the
curve showing the rise in CO2 in the atmosphere,
here's a good
example.
But
look at that curve again. Notice the saw-tooth shape. That means it's
a
dynamic equilibrium: the teeth on the saw represent winter in the
northern
hemisphere - when Green Things stop growing. (With apologies to New
Zealand,
Australia, etc. most of the southern hemisphere is
water).
In the northern hemisphere in Spring and Summer, Green Things start
growing
again, and basically what happens
is:
CO2 + Water + Sunlight(energy) => Cellulose [wood] +
Oxygen
- so Green Things eat CO2, and we go onto the downward slope of the saw
tooth.
Now if you look at the steepness of the slopes. [Stay with me here, this
get's
interesting again in a minute]. The drop due to what Green Things 'eat' in
one
year is about equal to 5 (five!) years of what we dump into the
atmosphere.
That means that atmospheric CO2 level would respond quite quickly to
changes
in what we dump. Put another way (look at the picture) we could quickly
(1-2
decades) reduce atmospheric CO2 to [previous] levels [...] if we stopped
dumping
more.
So finally here's the punch-line: if we think of the atmosphere+Green Things
system
as a balloon with a [pin-]hole in it; we have to keep blowing the CO2 into it
to
keep the levels up - if we stop, it goes down pretty fast. And what that
means
is that we have a
problem of
political will on our hands, we are not
victims
of our dirty CO2 emissive historical past. That's good news! If we can
only
yank the leash of our elected Important People, just
maybe...
Mean while [back in 2006] Canada's New Government
is [was] presenting a Clean Air Act,
duplicating
much existing legislation I understand, and with a proposal for
consultations
with industry about intensity-based reduction targets for 2050. Good
grief!
That's like the farmer saying to the fox: "I'd like to set a date next
year
to
discuss with you a target to steal fewer chickens in 10 years
time."
Fiddling while Rome
Burns.
Anecdote: When I was at Oxford there was a research building in the
science
campus off Parks Road in the Physics Dept. The sign by the main entrance
read:
"Atmospheric Physics: Top
Floor"
-which always struck me as amusing, as if you couldn't do atmospheric
physics
in the basement...Ha.