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Energy efficiency of energy conservation?
"Until the 1980s the term energy conservation was widely used, however during the 1980s most of the English speaking countries - the UK, US, Canada, Australia - tended to switch to the term energy efficiency. By the late 1980s, the European Commission too had switched from energy conservation to energy efficiency as its preferred term. Some other countries have tended to retain terms whose sense is closer to energy conservation than energy efficiency in their own languages although will often use .."More info of this article can be found on the web at:
http://www.iea.org/dbtw-wpd/textbase/work/2004/eewp/owen_paper.pdf