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<DIV><FONT size=2 face=Arial>Dear Tom,</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>here you have the text which explains the opinion
of IPCC and UN-FCC. They distinguish between biogen carbon and geogen carbon
like cement/beton and burned lime.</FONT></DIV>
<DIV><FONT size=2 face=Arial>This reference is accepted by the German
Governement. They think still there are 3 little pigs building a house
;-)))</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>It seems to be we are creating a subworld in the
big world. Great if there are connected...</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Nice day, Martin</FONT></DIV>
<DIV><B><FONT size=3>
<P>3.3.2 Speicherung von CO</FONT><FONT size=1>2 </FONT><FONT size=3>bzw.
Kohlenstoff in Produkten </P></B></FONT><FONT size=3 face=Arial,Arial><FONT
size=3 face=Arial,Arial>
<P>Der PAS 2050 schlägt vor, die (Zwischen-)Speicherung von
CO</FONT></FONT><B><FONT size=1>2 </B></FONT><FONT size=3 face=Arial,Arial><FONT
size=3 face=Arial,Arial>zu erfassen und nach einer vorgegebenen Formel von den
Gesamtemissionen abzuziehen (PAS 2050: 2008, p. 8). Beispiele sind Holz in
Möbeln, Papier in Büchern (jeweils biogener Kohlenstoff), Zement/ Beton oder
gebrannter Kalk (geogener Kohlenstoff). </P>
<P>Nach dem Verständnis von IPCC und UN-FCC (United Nations Framework Convention
on Climate Change) wird die Zwischenspeicherung von biogenem Kohlenstoff nicht
als Senke betrachtet. Letztlich stellt das nur eine Verschiebung auf nächste
Generationen dar. Gegen eine gesonderte Bilanzierung sprechen auch praktische
Gründe – der weitere Lebensweg der Produkte ist schwer vorherzusagen und der
(abziehbare) zwischengespeicherte Kohlenstoff ist mengenmäßig meist nicht
bedeutend. </P>
<P>Aus diesen Gründen sollte die Speicherung von biogenem Kohlenstoff nicht vom
PCF abgezogen werden. </P></FONT></FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=tom.woolley@btconnect.com href="mailto:tom.woolley@btconnect.com">Tom
Woolley</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=GSBN@greenbuilder.com
href="mailto:GSBN@greenbuilder.com">(private, with public archives) Global
Straw Building Network</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, May 07, 2010 2:19 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [GSBN] embodied energy and
sequestration</DIV>
<DIV><BR></DIV>
<DIV>Dear all</DIV>
<DIV><BR></DIV>Maybe there is confusion here between cement and lime
<DIV><BR></DIV>
<DIV>Lime can absorb C02 during carbonation and this can make a small
contribution to carbon sequestration over its life in a building</DIV>
<DIV><BR></DIV>
<DIV>Cement however does not in most cases as cement works best if it does not
carbonate unlike lime. </DIV>
<DIV><BR></DIV>
<DIV>The argument that C02 is stored in concrete is a bogus argument put
about by the cement and concrete industry to try and greenwash cement.</DIV>
<DIV>The carbonation argument seems to be based on the idea that concrete can
be crushed at the end of life and that this has some carbonation benefit</DIV>
<DIV>See</DIV>
<DIV><A
href="http://www.sustainableconcrete.org.uk/main.asp?page=85">http://www.sustainableconcrete.org.uk/main.asp?page=85</A></DIV>
<DIV><BR></DIV>
<DIV>The C02 is emitted during the manufacture of cement and is not recovered
in my opinion . It contributes to fossil fuel energy wastage and global
warming</DIV>
<DIV>Even the use of recycled material like ash involves energy though the
cement industry have made great strides in reducing this</DIV>
<DIV><BR></DIV>
<DIV>Cement manufacture remains one of the highest emitters of C02 in all
human activity as alternatives are not being used in many parts of the
world</DIV>
<DIV><BR></DIV>
<DIV>Pragmattically we probably all use a bit of cement from time to time but
it should be avoided if there are better alternatives like lime or earth</DIV>
<DIV>Here is an interesting paper which discusses these issues and compares
cement to alternatives</DIV>
<DIV><BR></DIV>
<DIV><A
href="http://www.springerlink.com/content/56266t21424h4854/">http://www.springerlink.com/content/56266t21424h4854/</A></DIV>
<DIV><BR></DIV>
<DIV><B>Calculation of sequestration in wood straw etc.</B></DIV>
<DIV><B><BR></B></DIV>
<DIV><B>A paper on this is being prepared by David Robson of University of
Cumbria and initial findings have been presented to the UK Renewable Building
Group</B></DIV>
<DIV><B>Several GSBN UK members are part of this group</B></DIV>
<DIV><B><BR></B></DIV>
<DIV><B>This research will be made available when complete and will hopefully
provide some hard data on the sequestration contribution of renewable bio
based materials</B></DIV>
<DIV><B><BR></B></DIV>
<DIV><B>Tom</B></DIV></BLOCKQUOTE></BODY></HTML>