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[en] This viewpoint article offers the proposition that purpose-grown biomass buried in landfills constitutes a 'virtual' biofuel that is more practical, economic, and immediate than the use of actual biofuels from cellulosics. While not a permanent solution, it may be a useful bridge to the hoped-for era of actual biofuels prior to the time technology for economically converting cellulosics to actual liquid biofuels is realized
[en] This article compares eight production/cost functions used or potentially useful for exploring how energy efficiency gains affect energy consumption. We show the practitioner's choice of function can inadvertently pre-determine results, and make recommendations as to which functions are flexible enough to prevent this. We also show pre-selected factor substitution elasticities can similarly pre-determine results. To aid the comparison we decompose the energy consumption 'rebound' effect into intensity and output/income effects, which also delivers insight into the mechanisms of rebound. We conclude by recommending practitioners restrict themselves to either the Gallant (Fourier) or the Generalized Leontief/Symmetric Generalized Barnett cost functions as being sufficiently 'rebound flexible.' The Translog cost function may be suitable given certain conditions and a particular form of the CES (Solow) function is a possible, but problematic, candidate. Along the way, the article provides a general methodology for similarly examining any arbitrarily-defined constant returns to scale production or cost function
[en] In this Communication, we seek to clarify confusion regarding our 2010 Journal of Physics article on historical rebound effects for lighting, which showed that global energy use for lighting has experienced 100% rebound over 300 years, six continents, and five technologies. We argue that our results have been misunderstood by some to mean lighting efficiency gains are counterproductive, and we instead argue for vigorously promoting improved lighting technologies. - Highlights: ► We clarify confusion about our 2010 Journal of Physics article on lighting. ► Over 3 centuries, increases in lighting energy efficiency have led to 100% rebound. ► Such gains create economic benefits despite the nominal absence of climate benefits. ► We argue that improved lighting technologies should be pursued vigorously.