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This study aims to quantify the environmentally sustainable and economically feasible potentials of agricultural and agro-industrial residues to generate electricity via direct combustion in centralised power plants in Brazil. Further, the energy savings and greenhouse gas (GHG) reduction potential of replacing natural gas-based electricity by bioenergy have been assessed. To this end, a methodology has been developed based on an integrated evaluation, incorporating statistical and geographical information system (GIS)-based analysis, and a life-cycle-assessment approach. Results reveal that the environmentally sustainable generation potential is nearly 141 TWh/year, mainly concentrated in the South, Southeast, and Midwest regions of the country. Sugarcane, soybean and maize crop residues are the major feedstocks for available bioenergy. On the other hand, the economic potential is far lower, accounting to 39 TWh/year. The total GHG mitigation is nearly 18 million tonne CO 2 e and could reach 64 million tonne CO 2 e yearly, if the technical potential is considered. The gap between technical and economic potentials implies that constraints to bioenergy are not related to a lack of resources, but rather associated to economic, logistical, regulatory and political barriers. [ABSTRACT FROM AUTHOR]

Agriculture, forestry and other land use (AFOLU) represent 22% of global greenhouse gas emissions. To meet the objectives of the Paris Agreement, the AFOLU sector greenhouse gases must be dramatically reduced and eventually transformed to net negative CO 2 e within this century. The decarbonisation choices will have significant environmental, social and economic impacts, yet few analytical frameworks exist able to account holistically for AFOLU mitigation strategies and their sustainable development impacts in a way that combines advantages of global and national approaches to decarbonisation pathways. This paper proposes a pathway design framework for AFOLU decarbonisation strategies that can help governments set targets across four types of levers (increasing sequestration; improving the emissions efficiency of agriculture; incentivising dietary changes; and displacing fossil fuels with bioenergy) and help them navigate potential synergies and trade-offs with sustainable development objectives (notably food security, biodiversity preservation, poverty alleviation and job creation), in a way that facilitates co-construction and discussion with main stakeholders. • Key drivers of AFOLU decarbonisation include enhancing carbon sequestration, increasing bioenergy production, reducing emission intensity of agriculture and shifting diets. • The AFOLU transformation has trade-off and synergies with SDGs, including food security, biodiversity, and poverty and jobs. • A comprehensive AFOLU pathway must integrate all key drivers and key SDGs to capture the systemic elements of the sector. • We propose a method for designingcomprehensive AFOLU pathways, integrating all key drivers and key SDGs. • The pathway design framework emphasises co-construction and dialogue with key stakeholders. [ABSTRACT FROM AUTHOR]

This work evaluates implications of incorporating LCA-GHG (life cycle assessment of GHG emissions) into the optimisation of the power generation mix of Brazil through 2050, under baseline and low-carbon scenarios. Furthermore, this work assesses the impacts of enacting a tax on LCA-GHG emissions as a strategy to mitigate climate change. To this end, a model that integrates regional life cycle data with optimised energy scenarios was developed using the MESSAGE-Brazil integrated model. Following a baseline trend, the power sector in Brazil would increasingly rely on conventional coal technologies. GHG emissions from the power sector in 2050 are expected to increase 15-fold. When enacting a tax on direct-carbon emissions, advanced coal and onshore wind technologies become competitive. GHG emissions peak at 2025 and decrease afterwards, reaching an emission level 40% lower in 2050 than that of 2010. However, if impacts were evaluated through the entire life cycle of power supply systems, LCA-GHG emissions would be 50% higher in 2050 than in 2010. This is due to loads associated with the construction of plant infrastructures and extraction and processing of fossil fuel resources. Thus, taxes might not be as effective in tackling GHG emissions as shown by past studies, if they are only applied to direct emissions. [ABSTRACT FROM AUTHOR]