[GSBN] embodied energy comparisons

[martin oehlmann]

Dear all, 

however not much response here on this issue...  some possible interesting observations in the meantime:

According the perception of IPCC and UN-FCC straw and wood are not seen as CO2-sink, yet CO2 neutral, cause of the durability is "difficult" to calculate. In contrary cement-based products in contrary are accepted to reduce the PCF (product-carbon-footprint) as the CO2 used for production is stored for a long time. (source: Memorandum Product Carbon Footprint, German Ministry for Environment, Nature Protection etc.)
Comment: compliments for the cement lobby, low cost cementbased massproduction for housing with a lifespan 30-40 years. 

If planted forests get cut after 30 years and seen as a CO2 sink, a high quality building which lasts 100 years and longer built with natural materials better should be perceived as storage, if the intention from IPCC and UN-FCC is to support sustainable constructions. 

Nice day and all the very best,

Martin Oehlmann

Brittany
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