Tord Eriksson wrote: > Oh, is it?! Considering the millions of tons concrete that is needed, and > knowing how concrete is made, it sure uses up a lot of energy, Making cement means releasing CO2 from limestone. Worldwide, cement manufacturing is a significant source of CO2. While building a nuke consumes a lot of concrete, I don't know how much CO2 results directly compared to the use of other fuel for generating electricity. > But in those days a nuclear power station had a practical life of 20 years, > now they more like 50, or more! In most engineering endeavours, the design life is somewhat shorter than the useful life. The design life of a typical building is only 50 years but most can last a lot longer. Mechanical and electrical systems do wear out over the design lifespan and get replaced, but the structure just goes on. > as the losses involved are massive (for instance charging > batteries usually involve a 40% loss in the form of heat), On the plus side, some of the newer technology batteries are reducing this to the 20-30% range. Mike *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Mon Jul 02 2007 - 07:26:19 PDT
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