Greenhouse gas emissions related to biodiesel from traditional soybean farming compared to integrated crop-livestock systems
| Autor: | D. J. Bungenstab, Cláudia do Rosário Vaz Morgado, Ofélia de Queiroz Fernandes Araújo, Victor Paulo Peçanha Esteves, Elisa Maria Mano Esteves |
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| Rok vydání: | 2018 |
| Předmět: |
Biodiesel
Renewable Energy Sustainability and the Environment business.industry 020209 energy Strategy and Management 05 social sciences 02 engineering and technology Agricultural engineering Industrial and Manufacturing Engineering Diesel fuel Biofuel Agriculture Biodiesel production Greenhouse gas 050501 criminology 0202 electrical engineering electronic engineering information engineering Environmental science business Hectare Life-cycle assessment 0505 law General Environmental Science |
| Zdroj: | Journal of Cleaner Production. 179:81-92 |
| ISSN: | 0959-6526 |
| Popis: | Biodiesel has great potential to reduce greenhouse gas emissions, as an alternative to fossil diesel. However, its production occurs under different agricultural systems, with different levels of emissions in the farming phase. Integrated crop-livestock systems can play an important role in this sense, since they combine livestock with crop farming, optimizing land and input usage, with good potential to reduce total emissions from energy and food agriculture. This study compares integrated crop-livestock systems with traditional soybean farming systems regarding biodiesel production, through life-cycle assessment. Additionally, it compares different integrated crop-livestock systems in Central Brazil, to evaluate their impact regarding greenhouse gas emissions. The life cycle assessment performed adopts two approaches to apportion the farming phase emissions (sub-process division and system expansion), as well as two functional units (emissions per hectare and per kilogram of biodiesel). The system expansion approach appears to be the most suitable because the studied agropastoral systems have strong reciprocal relationship and exchange of benefits among the different farming activities. This approach also considers co-products as avoided products, showing that the whole integrated system is environmentally more attractive due to negative emissions. When analyzing only biodiesel production, results show no substantial difference between traditional and integrated systems. Therefore, the factors with the greatest impact on biodiesel production, concerning GHG emissions, are the frequency of rotation (pasture/crop) and type of management in the agricultural system. |
| Databáze: | OpenAIRE |
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