--- In papercreters@yahoogroups.com, Mikey Sklar <sklarm-yahoo@...>
wrote:
>
>
> I have been tormented by a few local adobe and straw bale builders
> for my use of Portland cement. They point out to me that by using
> a high energy product that I am destructive to the environment. I
> had my doubts and decided to run some numbers this evening about
> just how much CO2 was being produced to create a bag of portland.
> The answer I came to was less than 26lbs of CO2 per 94lb bag of
> portland. I suppose I can now point out to the so called green
> builders who are hauling straw bales or pre made adobes from across
> state boarders that their CO2 footprint is orders of magnitude larger
> than my own.
Okay, you had to get me googling, didn't you???
http://www.us-concrete.com/news/features.html
Okay, so your numbers vary from their, but as SG pointed out, they
count the outgassing of the limestone, the vehicles used in the
distribution, electricity, etc. So by their figures a 94lb bag of
portland produces / releases about 94 lbs of CO2.
I would like to get more info and see how this really compares to
other materials like stick frame and consider the off-set that is
provided by the long term reduced energy use due to higher insulative
values in PC. Harder to determine would be life-span of material,
reduction of CO2 impact from house fires (release and extenguishing
related), etc.
- E
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