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Biogas production and use can represent a win-win strategy providing multiple opportunities to mitigate the emission of greenhouse gases responsible for climate change, while offering a range of important social, environmental and economic benefits. Nevertheless, as for other bioenergy pathways, biogas sustainability needs to be carefully assessed and continuously monitored in light of the specific geographic and temporal context in which it performs. This paper aims to provide a comprehensive review on the sustainability assessment of domestic production and use of biogas in Italy, with a focus on the environmental dimension of the sustainability. Furthermore, it elaborates the results of the review to perform an ex-novo sustainability assessment of biogas pathway at national level, through the methodology developed by the Global Bioenergy Partnership. The biogas value chain in Italy can play a positive role to foster the transition towards an ecological and circular economy. This paper highlights both weaknesses and strengths of the biogas value chain in Italy and points out existing differences, in relation to the sustainability of the value chain, between various geographical areas of the country. The outcomes of this study could inform, both at national and international scale, the drawing of tailor-made policies and measures to reduce biogas-related potential risks of environmental impacts, as well as to support the replication and scaling up of successful management practices. Furthermore, they could serve as a baseline for the future monitoring of the sector. Ultimately, the paper reports the key difficulties encountered in the implementation of the GBEP methodology and the solutions adopted to overcome them. [Display omitted] • Three-quarters (75.4%) of the Italian biogas production takes place in the Po river valley, one-third comes from Lombardy. • Maize silage and livestock manure are the most common feedstocks in Italian biogas plants. • Roughly 80 k tons of nitrogen contained in livestock manure were treated by biogas plant in Italy in 2016. • The main source of GHG emissions along the biogas pathway in Italy lies in the cultivation of dedicated bioenergy crops. • Water shortage hampers the development of the biogas sector in southern Italy, restricting the cultivation of energy crops. [ABSTRACT FROM AUTHOR]

Several EU and neighboring countries have relevant surfaces of land that are currently largely marginal, under-utilized and/or contaminated (MUC). In the last decade, many scientific studies have demonstrated how bioenergy crops have the potential to be grown profitably on this land and can therefore offer a source of income to local populations while contributing to achieving the targets of the new Renewable Energy Directive (REDII). In this context, the paper analyses the main agronomic and techno-economic aspects affecting the uptake of cellulosic ethanol or second generation (2G ethanol) production on MUC lands in the Ivankiv Region of Ukraine, a lower-middle income country, and in the Sulcis area of Sardinia in Italy, a high-income country. The use of MUC lands for the production of 2G ethanol mitigates negative impacts on food security by reducing the risk of indirect land use change (iLUC). The findings suggest that 2G ethanol would be produced at a cost of EUR 936/ton in Italy and EUR 758/ton in Ukraine, with a substantial reduction in greenhouse gas (GHG) emissions. Furthermore, the study describes the main barriers and obstacles to the market uptake of 2G ethanol and analyses the effects of existing policies on the economic feasibility of the fuel production in those countries. Current policies do not allow the production of 2G ethanol to be competitive on the market; the study highlights the need to provide consistent and stable long-term bioenergy policies, including but not limited to financial support, to facilitate market penetration and competitiveness. Image 1 • An agricultural and economic feasibility assessment of cellulosic ethanol production in Ukraine and Italy was developed • A calculation of feedstock production costs and ethanol production costs in those countries was carried out • A sustainability assessment of selected advanced value chains developed on MUC lands was done • Review and assessment of policy framework for the market uptake of cellulosic ethanol in Ukraine and Italy was carried out [ABSTRACT FROM AUTHOR]