Does intensification result in higher efficiency and sustainability? An emergy analysis of Mediterranean sheep-crop farming systems

Asensio, 2004 Barrantes, 2009, Categorization of grazing systems to aid the development of land use policy in Aragon, Spain, Grass Forage Sci., 64, 26, 10.1111/j.1365-2494.2008.00666.x Barrantes, 2005, 771 Bell, 2012, Integrated crop–livestock systems in Australian agriculture: trends, drivers and implications, Agric. Syst., 111, 1, 10.1016/j.agsy.2012.04.003 Bernués, 2011, Sustainability of pasture-based livestock farming systems in the European Mediterranean context: synergies and trade-offs, Livest. Sci., 139, 44, 10.1016/j.livsci.2011.03.018 Bouwman, 2005, Exploring changes in world ruminant production systems, Agric. Syst., 84, 121, 10.1016/j.agsy.2004.05.006 Brown, 2000, Emergy synthesis: an introduction, 1 Brown, 2007, 1229 Brown, 1996, Embodied energy analysis and EMERGY analysis: a comparative view, Ecol. Econ., 19, 219, 10.1016/S0921-8009(96)00046-8 Brown, 1997, Emergy-based indices and ratios to evaluate sustainability: monitoring economies and technology toward environmentally sound innovation, Ecol. Eng., 9, 51, 10.1016/S0925-8574(97)00033-5 Brown, 2004, Energy quality, emergy, and transformity: H.T. Odum's contributions to quantifying and understanding systems, Ecol. Model, 178, 201, 10.1016/j.ecolmodel.2004.03.002 Campbell, 2014, The eco-price: how environmental emergy equates to currency, Ecosyst. Serv., 7, 128, 10.1016/j.ecoser.2013.12.002 Castellini, 2006, Sustainability of poultry production using the emergy approach: comparison of conventional and organic rearing systems, Agric. Ecosyst. Environ., 114, 343, 10.1016/j.agee.2005.11.014 Cavalett, 2006, Emergy assessment of integrated production systems of grains, pig and fish in small farms in the South Brazil, Ecol. Model, 193, 205, 10.1016/j.ecolmodel.2005.07.023 Cuadrat, 2007 Feuz, 1992, Typical farm theory in agricultural research, J. Sustain. Agric., 2, 43, 10.1300/J064v02n02_05 Hau, 2004, Promise and problems of emergy analysis, Ecol. Model, 178, 215, 10.1016/j.ecolmodel.2003.12.016 Henle, 2008, Identifying and managing the conflicts between agriculture and biodiversity conservation in Europe–A review, Agric. Ecosyst. Environ., 124, 60, 10.1016/j.agee.2007.09.005 Jarrige, 1989 Machín, 1998, Spatial analysis of gypsiferous soils in the Zaragoza province (Spain), using GIS as an aid to conservation, Geoderma, 87, 57, 10.1016/S0016-7061(98)00071-8 Mathews, 2014, Renewable energy technologies: panacea for world energy security and climate change?, Procedia Comput. Sci., 32, 731, 10.1016/j.procs.2014.05.483 Nguyen, 2016, Quantifying environmental externalities with a view to internalizing them in the price of products, using different monetization models, Resour. Conserv. Recycl., 109, 13, 10.1016/j.resconrec.2016.01.018 Odum, 1955, Time's speed regulator: the optimum efficiency for maximum power output in physical and biological systems, Am. Sci., 43, 331 Odum, 1983 Odum, 1996 Odum, 2000 Olaizola, 1995, 439 Pérez, 2007, Technical efficiency of meat sheep production systems in Spain, Small Ruminant Res., 69, 237, 10.1016/j.smallrumres.2006.02.003 Pimentel, 2009, Energy inputs in food crop production in developing and developed nations, Energies, 2, 1, 10.3390/en20100001 Ripoll-Bosch, 2013, Accounting for multi-functionality of sheep farming in the carbon footprint of lamb: a comparison of three contrasting Mediterranean systems, Agric. Syst., 116, 60, 10.1016/j.agsy.2012.11.002 Ripoll-Bosch, 2012, An integrated sustainability assessment of Mediterranean sheep farms with different degrees of intensification, Agric. Syst., 105, 46, 10.1016/j.agsy.2011.10.003 Rótolo, 2007, Emergy evaluation of grazing cattle in Argentina's Pampas, Agric. Ecosyst. Environ., 119, 383, 10.1016/j.agee.2006.08.011 Rydberg, 2006, Emergy evaluations of Denmark and Danish agriculture: assessing the influence of changing resource availability on the organization of agriculture and society, Agric. Ecosyst. Environ., 117, 145, 10.1016/j.agee.2006.03.025 Ryschawy, 2012, Mixed crop-livestock systems: an economic and environmental-friendly way of farming?, Animal, 6, 1722, 10.1017/S1751731112000675 Strijker, 2005, Marginal lands in Europe - causes of decline, Basic Appl. Ecol., 6, 99, 10.1016/j.baae.2005.01.001 Ulgiati, 1998, Monitoring patterns of sustainability in natural and man-made ecosystems, Ecol. Model, 108, 23, 10.1016/S0304-3800(98)00016-7 Vigne, 2013, Emergy evaluation of contrasting dairy systems at multiple levels, J. Environ. Manage, 129, 44 Wang, 2015, Sustainability evaluation of the large-scale pig farming system in North China: an emergy analysis based on life cycle assessment, J. Clean. Prod., 102, 144, 10.1016/j.jclepro.2015.04.071 Wilkinson, 2011, Re-defining efficiency of feed use by livestock, Animal, 5, 1014, 10.1017/S175173111100005X