2.2 The scenarios2.2.1 Socioeconomic premises and reference scenario2.2.2 Climate policy scenarios2.2.2 Climate policy scenarios3 Results3.1 Emissionstable_1Fig. 1 GHG emission trajectories 2015–2050 (a) and CO2 sequestration post-2030 (b). FFI fossil fuel and industry. The black dots indicate the NDC pledged targets. The category “Other” includes GHG sources not modeled in BLUES. They are dominated by indirect nitrous oxide emissions but also include emissions of hydrofluorocarbons (HFCs), methane from livestock other than cattle and poultry, and nitrous oxide from organic soils. The value for 2010 from GoB (2015b) and are assumed constant throughout the periodnan3.2 Carbon sequestration3.2 Carbon sequestration3.3 Land use and land use change3.3 Land use and land use change3.4 Primary energytable_2Fig. 3 Primary energy consumption (PEC) (a), share of bioenergy in PEC (b), power generation (c), and share of non-hydro renewable energy in power generation (d) in Brazil. The black dots show the NDC targets for the plotted quantities3.5 Power generation3.5 Power generation3.6 Biofuelstable_3Fig. 4 Biofuels production (a) and passenger transportation fuel mix (b) deployed to meet energy services demand in Brazil. Ethanol_A is anhydrous ethanol blended into gasoline at 27.5% by volume3.7 Transportation3.7 Transportation4 Discussion4 Discussion4 Discussion4 Discussion4 Discussion4 Discussion5 Conclusions5 Conclusions5 ConclusionsReferencesReferencesReferencesReferencesReferencesReferencesenergy.2016.03.062energy.2016.03.062energy.2016.03.062energy.2016.03.062energy.2016.03.062Affiliationstable_1Engenharia Agrícola ISSN: 1809-4430 (on-line) www.engenhariaagricola.org.brSpecial Issue: Energy in AgricultureGEOTHERMAL ENERGY: AN ALTERNATIVE TO THE WATER–ENERGY DILEMMA IN NORTHEASTERN BRAZIL Francisco T. G. Lima Verde Neto1, Paulo A. C. Rocha1, Jenyffer da S. G. Santos2,GEOTHERMAL ENERGY: AN ALTERNATIVE TO THE WATER–ENERGY DILEMMA IN NORTHEASTERN BRAZILDb)0/COV+=IUamy 0BNUr2.2 The scenarios2.2.1 Socioeconomic premises and reference scenario The scenarios explored here are based on Shared Socioeconomic Pathway 2 (SSP2) assump- tions (Fricko et al. 2017; Riahi et al. 2017), meaning that they do not include structural socioeconomic changes from historical trends in Brazil. GDP growth rates for Brazil were updated from SSP2 projections (Dellink et al. 2017) to reflect the near-term 2010–2020 growth rates (Köberle et al. 2018). The Reference scenario (Ref) in this study includes the most relevant public policies in effect in the country today which may impact GHG emissions. These include non-climate policies such as biofuel blending mandates and renewable energy auctions, and climate policies that are already under implementation such as the ABC Plan (MAPA 2012). Most of the mitigation measures included in the Brazilian NDC (GofB 2015a) are already in effect today through existing policies (Köberle et al. 2015). Table S1 shows the policies implemented in the construction of the scenarios described here. The Ref scenario also includes an assumption of full implementation of the 2012 Forest Code via forcing net-zero deforestation post-2030, as compliance with the Code requires afforestation on some 30 Mha (Soares-filho et al. 2014). Finally, EV costs are projected to reach cost parity with conventional vehicles by 2040. Although EV cost parity by 2040 may seem overly conservative given recent developments (BNEF 2017), the lack of structural socioeconomic changes may imply light-duty vehicles (LDVs) in the country will continue to cost more than they do abroad. Thus, since there are currently no policies to incentivize EVs, we assume the country will lag behind global cost developments by about a decade. This also applies to electric trucking, which faces the additional barriers from deficient infrastructure in the country in the form of badly maintained roads and an unreliable electricity grid. For this reason, electric trucks are not included in the options available to the model.2.2.2 Climate policy scenarios Three climate mitigation scenarios explore progressively more stringent emission constraints based on the current policy scenario (Ref) with various emissions constraints, including two early-action scenarios (mitigation from 2020) and one delayed-action scenario (from 2030). Two scenarios are consistent with global efforts to stay below 2 °C average temperature rise above pre-industrial levels: one early-action (2 deg) and one delayed-action scenario in which mitigation begins only after following the Ref trajectory through 2030 (2deg_dly). Finally, the third scenario is a 1.5 °C scenario (1p5deg) that assumes early-action consistent with Brazil’s contribution to a global 1.5 °C target (Kriegler et al. 2019). The climate mitigation scenarios were implemented via emissions budgets, as described in detail in the SOM. We apply resulting mid-century budgets for Brazil’s share of a global 1000 Gt of CO2 (consistent with a > 66% chance of staying within 2 °C) and 400 Gt of CO2 (in nan Climatic Change (2020) 162:1823–1842 line with a > 66% chance of staying within 1.5 °C warming limit by 2100), taken from cost- optimal global runs of the COFFEE model (Rochedo 2016; Rochedo et al. 2018; Roelfsema et al. 2020) for each of the temperature targets. The COFFEE model is a global integrated assessment model (IAM) built on the same platform as BLUES and having a similar structure, in which Brazil is represented as a single region in a world comprised of 18 regions (see SOM). Because COFFEE runs through 2100 and BLUES only through 2050, the COFFEE cumulative emission budgets for 2010–2050 were used. The COFFEE model was chosen for several reasons. First, it is built on the same modeling platform as BLUES and follows a similar logic and structure. Second, it has one of the best sectoral representations of Brazil among all the IAMs since it was built to explicitly represent Brazil’s role in the world and many IAMs do not even have Brazil represented as separate from Latin America (see Section S1.3.2).The 2010–2050 budgets implemented in BLUES were as follows: 23.6 Gt CO2, for the 2 deg and 2deg_dly scenarios and 15.4 Gt CO2 for the 1p5deg scenario. These emission budgets represent about 15 years of the country’s 2010 emissions for the 2 °C scenarios and about 10 years for the 1.5 °C scenarios. The budgets were implemented in BLUES as a cap on cumulative CO2 emissions and, to limit emissions of non-CO2 GHGs, these were priced at GWP-AR4 equivalency2 starting in 2020, as explained in SOM Section S2. The resulting budgets are close to the median from other IAMs for Brazil (see Section S1.3.2). For more details on the scenario protocols used in this paper see Schaeffer et al. (2020, this issue).3 Results Results indicate key linkages between AFOLU, transportation, and energy sectors. They point to the fundamental role of AFOLU in Brazil’s mitigation efforts, with its emissions becoming negative before those of the energy sector. Intensification of livestock contributes significantly to AFOLU CO2 abatement in BLUES, thereby increasing the currently low stocking rate of Brazilian pastures. In fact, this occurs even in the absence of emissions constraints, which is explained by the low or negative abatement cost of this measure, its large potential, and continuing implementation of the ABC Plan3 (MAPA 2012). Introduction of iCLF systems makes important contributions to improve yields. As mitigation targets become more stringent (tighter CO2 budgets), technological shifts further decarbonize sectors with remaining mitigation potential. In the energy sector, mitiga- tion measures include low-carbon sources for all energy carriers, fuel switch in transportation, and energy efficiency in industry and transportation, along with transitions to low-carbon power generation from biomass, wind and solar. The transportation sector stands out as having a significant potential for emission reductions through the use of biofuels, with and without CCS,4 and the electrification of the LDV passenger fleet. Introduction of EVs in budget scenarios leads to higher electricity consump- tion, affecting power generation expansion strategies the mix of biofuel production, also impacting the agricultural sector. 2 The energy module in BLUES was built prior to the release of GWP-AR5 values. 3 The energy module in BLUES was built prior to the release of GWP-AR5 values. 3 The model results provide evidence to the economic advantage of intensifying livestock production in Brazil. However, several market barriers (as identified by Gil et al. (2015) and Köberle et al. (2017)) still hamper large- scale adoption in the country. 4 CCS here is applied in the production phase of the biofuel, not in the transportation sector per se. nan Climatic Change (2020) 162:1823–1842 We explore these dynamics in the following sections and offer deeper analyses in the discussion section.3.1 Emissions Figure 1a shows resulting GHG emission trajectories in each scenario. Emission reductions in budget scenarios result mainly from reductions in CO2 emissions with some contribution from CH4 and N2O reductions in the short-term. Emissions of both CH4 and N2O drop in the short-term but return to 2015 levels by the end of the period due to increased activity of their sources, mainly in the AFOLU sectors. One distinct aspect of Brazil’s emission profile is the high share of non-CO2 gases, particularly CH4 and N2O from AFOLU sectors. Across budget scenarios emissions of non-CO2 gases dominate towards 2050, as net CO2 emissions become negative. The effect of the net-zero deforestation assumption is clear by the sudden drop in AFOLU CO2 emission post-2030, highlighting the impact that full implementation of the Forest Code can have on the country’s climate action. Brazil’s GHG emission targets pledged in the NDC are shown as black dots in Fig. 1a. Some key insights can be drawn from this figure: (i) the Ref scenario shows current policies are only partially in line with NDC targets and that strengthening of ambition may be required for the country to meet its 2030 emissions target; (ii) policies helping Brazil to meet its NDC would put the country within a trajectory consistent with a least-cost, global end-of-century 1.5 °C target in 2025, but the 2030 target would need to be strengthened; and (iii) delayed-action to 2030 would imply drastic measures towards 2040 in order to bring the country closer to a cost-optimal trajectory to a well-below 2 °C global target. These insights should contribute to Brazil’s development of its mid-century strategy for climate action.table_1Fig. 1 GHG emission trajectories 2015–2050 (a) and CO2 sequestration post-2030 (b). FFI fossil fuel and industry. The black dots indicate the NDC pledged targets. The category “Other” includes GHG sources not modeled in BLUES. They are dominated by indirect nitrous oxide emissions but also include emissions of hydrofluorocarbons (HFCs), methane from livestock other than cattle and poultry, and nitrous oxide from organic soils. The value for 2010 from GoB (2015b) and are assumed constant throughout the periodnan Climatic Change (2020) 162:1823–18423.2 Carbon sequestration Figure 1b shows that long-term reductions in CO2 emissions in Brazil can be achieved mainly through a combination of AFOLU efforts and deployment of CCS technologies in the energy sector. Brazil’s large biofuels potential (Smeets and Faaij 2010) and the availability of sequestration sites (Rochedo et al. 2016) mean it can deploy significant levels of bioenergy with CCS (BECCS5) to help further decarbonize its economy. The figure shows total CO2 sequestered and through which measure and is not limited to carbon removal from the atmosphere. AFOLU sequestration is the aggregate result of (i) intensification of livestock production, via conversion of low-capacity pastures to high-capacity pastures and integrated systems, and (ii) afforestation via growth in planted forests and regrowth of natural forests (see Section 3.3). There is more BECCS in the late-accession 2deg_dly than in the 1p5deg scenario due to the shorter time period available to decarbonize. Negative CO2 emissions in Fig. 1a come from contributions of energy-sector CCS and AFOLU sequestration (Fig. 1b). BECCS becomes increasingly important as the mitigation challenges become tougher. Carbon capture occurs in electricity generation and also in the production of ethanol, BTL-kerosene and BTL-diesel (Tagomori 2017; Tagomori et al. 2019), used to decarbonize the transport sector. CO2 capture in the fermentation phase of ethanol production is a result we have reported elsewhere (Herreras-Martínez et al. 2015; Koberle et al. 2015), an important mitigation option for Brazil (see Section 3.6). BECCS deployment in the 1p5deg and 2deg_dly scenarios reaches cumulative sequestration of around 2.2 Gt of CO2 by 2050. It must be said that negative emissions can be costly in energy and economic terms, and very clear governance protocols would need to be in place to account for sequestered CO2 (Gough et al. 2018; Peters and Geden 2017). Although CCS costs are currently high, they are projected to fall in the medium- to long-term (Budinis et al. 2018). In addition, carboduct networks would need to be built to carry captured CO2 to injection sites, adding to the governance issues surrounding CCS (Merschmann et al. 2016; Tagomori et al. 2018).Policies to support and regulate CCS in Brazil are lacking (da Costa 2014).3.3 Land use and land use change As mentioned before, AFOLU sectors play an important part in Brazil’s mitigation effort. Land use change (LUC) from 2015 across scenarios is shown in Fig. 2. Results show that intensification of livestock causes significant reduction in low-capacity pasture area, which is transformed into high-capacity pastures (with average stocking rates twice as high), integrated systems and cropland. This holds across all scenarios, including current policies, where a reversal of the growth trend of low-capacity pastures indicates this as an attractive measure even in the absence of climate policies, in line with increasing interest in such systems given their demonstrated potential for higher profitability (De Oliveira et al. 2013). The steep changes in pasture area from low-capacity to high-capacity in Fig. 2 are equivalent to a conversion of about 50 Mha in 30 years, a little more than 1.5 Mha per year. This is not unprecedented. A transition at this rate and scale has occurred before in Brazilian agricultural 5 BECCS is understood to include both bioelectricity generation and bioliquids production with CCS. nan Climatic Change (2020) 162:1823–1842 production systems. Between 1992 and 2012, no-till agriculture spread across some 30 Mha and is today used in more than 50% of grain area in the country (Inagaki et al. 2016). To meet the demands for food, fiber, and energy, about 12 Mha of low-capacity pastures are converted to high-capacity in the Ref scenario, indicating current trends will almost meet the stated NDC goal of 15 Mha. On the other hand, there is an increase of only 0.2 Mha hectares of integrated systems, well short of the 4 Mha pledged in the NDC. Likewise, the 0.5 Mha of planted forests fall short of the target for additional 4 Mha. Cultivated land increases while natural lands decrease in the short-term and slightly recover post-2035 in mitigation scenarios. Table S1 shows area changes in 2050 relative to 2010 for each land cover type in Fig. 2. Across all scenarios, agricultural land (crops and livestock) peaks between 2025 and 2030 at around 295 Mha.In the Ref scenario, converted lands do not return to their original cover by 2050. However, as the budgets become more stringent, intensification of agriculture drives the conversion of low-capacity pastures to high-capacity pastures and integrated systems, reducing total area devoted to livestock production. Abandoned pastureland is converted to cropland and planted forests or left to regrow with natural vegetation, especially tropical forests (strong carbon sinks). By diminishing demand for land, agricultural intensification allows forests to recover significant shares of lost area. Savannas recover much less because of their lower carbon stock, implying further losses to the biodiversity-rich Cerrado biome. In the 2deg_dly scenario by 2050, roughly the same extent of forest area converted to agricultural use (~ 6 Mha) since 2015 is returned to natural forests (afforestation) (Fig. S8).3.4 Primary energy The continuing growth trend in PEC is clearly reflected in the Ref scenario, with increases across the range of currently-used energy sources (Fig. 3a). In the budget scenarios, (lignocellulosic) biomass and sugarcane increasingly replace oil and coal as emission Climatic Change (2020) 162:1823–1842 constraints become tighter. In the most stringent cases (1p5deg and 2deg_dly), coal virtually disappears and oil consumption drops by more than 80% (completely disappearing in 2deg_dly), forcing the refining sector to adjust. Biomass share grows to scenario-dependent 50–75% of total PEC by 2050, with profound impacts on land demand for bioenergy, which helps explain some of the land-use dynamics described in Section 3.3 (see Section 4). Competition between biomass and sugarcane is largely determined by assumptions for their respective technoeconomic parameters. In the current version of BLUES, biomass production from grasses stands out as the least-cost feedstock source for biofuels production via biomass- to-liquids Fischer-Tropsch (BTL-FT) synthesis of biodiesel and biokerosene. However, BTL- FT synthesis is currently non-existent in Brazil, meaning this novel technology is deployed gradually, ramping up capacity at a rate commensurable with industrial capacity (SOM Section S1.2.2). Figure 3b shows this growth of bioenergy, which reaches between 65 and 80% share of PEC in 2050 across budget scenarios. Additionally, the NDC target of 33% bioenergy in PEC is already met in the cost-optimal Ref scenario.table_2Fig. 3 Primary energy consumption (PEC) (a), share of bioenergy in PEC (b), power generation (c), and share of non-hydro renewable energy in power generation (d) in Brazil. The black dots show the NDC targets for the plotted quantities nan Climatic Change (2020) 162:1823–18423.5 Power generation Hydropower remains the mainstay of the Brazilian power system, but its share drops across all scenarios (Fig. 3c, d). In the absence of climate policies (Ref), coal power generation gains space after 2030 in this cost-optimization model, as it produces the lowest-cost electricity, in line with other baseline scenarios previously reported elsewhere (Köberle et al. 2015, 2018; Lucena et al. 2016; Portugal-Pereira et al. 2016). Nonetheless, wind, solar, and nuclear generation also see significant increases in the Ref scenario. As emission constraints are introduced, bioelectricity increasingly pushes coal out of the energy mix. Coal-fired capacity is replaced in all budget scenarios by bioelectricity production with and without CCS, from both sugarcane bagasse6 and other biomass feedstocks (Fig. 3c). A small amount of legacy coal-fired generation remains through 2050 from lignite mines in the South region of Brazil. Counterintuitively, oil-fired generation without CCS enters the solution of budget scenar- ios, explained by the fact that diesel fuel is gradually decarbonized through blending of BTL- FT biodiesel, surpassing 70% of the diesel pool by 2050 (Section 3.6). In addition, some competition occurs between biomass-fired electricity (mostly from bagasse and residues) and non-biomass renewables (hydro, solar, and wind). This results from the need for negative emissions in the long-term to compensate for higher emissions in the short-term, and so BECCS is used to both meet electricity demand and remove CO2 from the atmosphere. All budget scenarios deploy large amounts of bioelectricity from sugarcane and lignocellulosic sources, with and without CCS. Bagasse is a by-product and has null cost, while biomass provides firm power which gives it the advantage of not requiring back-up capacity as is the case for intermittent sources. The budget scenarios also boast slightly higher electricity demand, spurred by the electrification of the LDV fleet (Section 3.7). Nonetheless, non-biomass renewables grow in all scenarios. Wind power reaches levels comparable to today’s bioelectricity production from bagasse (~ 0.2 EJ/year in 2050), and solar also grows.Brazil has potential for solar and wind exceeding the values deployed in these scenarios by BLUES (CEPEL 2013; Simioni and Schaeffer 2019), but the CCS option makes bioelectricity more attractive. As with any cost-optimization model, different cost and effi- ciency assumptions may yield different results, potentially tipping the scales in favor of wind and solar over bioelectricity. PV costs were updated to reflect recent developments, but the stringent emission constraints favor BECCS deployment. In spite of these increases, non- hydro renewables fail to meet the NDC target share of 33% of power generation.3.6 Biofuels Important changes happen in the biofuel sector as emission budgets tighten (Fig. 4a). The sharp increase in production in the stringent scenarios is driven by the need to decarbonize freight transportation and aviation. By 2050, ethanol and FAME biodiesel (1st Gen) produc- tion have peaked and returned to near 2015 levels. Importantly, most of the ethanol and advanced biofuels are produced with CCS in the production phase of the fuel, leveraging these low-cost options available to the model. Ethanol production decreases following increasing penetration of EVs in the LDV fleet. 6 Sugarcane bagasse is the solid residue after sugarcane is crushed to extract the juice from which sugar and 1st generation ethanol are made. nan Climatic Change (2020) 162:1823–1842table_3Fig. 4 Biofuels production (a) and passenger transportation fuel mix (b) deployed to meet energy services demand in Brazil. Ethanol_A is anhydrous ethanol blended into gasoline at 27.5% by volume BTL-diesel with CCS is used to decarbonize road freight transportation, by far the most important modal for freight in Brazil (EPE 2014). Production of advanced biofuels reaches high-enough levels to completely replace oil products in the 2deg_dly scenario by 2050, meaning both diesel and kerosene are low-carbon biofuels after 2030 since diesel fuel is gradually decarbonized by the blending of BTL-FT biodiesel, surpassing 64%, 69%, and 70% (2 deg, 1p5deg, 2deg_dly, respectively) of the diesel pool by volume in 2050. The high share of BTL-diesel in diesel fuel also enables diesel engine busses to remain an option for passenger transportation throughout the period across scenarios. Interestingly, BTL-biojet fuel enters the mix in the Ref scenario, which is unexpected. The model chooses to deploy BTL technology instead of expanding the jetfuel capacity in refineries, which is currently limited in the country (Carvalho 2017). All scenarios have BTL-kerosene accounting for 100% of jetfuel demand as early as 2040, although in reality some technical limitations may preclude this.3.7 Transportation As global prices of hybrid (HYB), plug-in hybrid (HUYB), and electric vehicles (EV) are projected to drop in the short- to medium-terms, these become important alternatives to decarbonize passenger transportation using the country’s low-carbon electricity. Hybrid and EV costs are implemented in BLUES to reach parity with conventional cars by 2040. Thus, nan Climatic Change (2020) 162:1823–1842 starting in that year, the model switches to EVs in the light commercial category (mostly taxis), that is, the least efficient LDVs in the model delivering transportation services. The model also completely shifts from internal combustion engine (ICE) motorcycles to fully electric 2- wheelers starting in 2030 in all budget scenarios. Figure 4b shows passenger transportation fuel mix across scenarios for modeled years 2015, 2030, and 2050 (for a similar figure for freight fuels, see Fig. S5). Growing demand for mobility services in Brazil is reflected by the growing energy demand of passenger transpor- tation towards 2050. In spite of higher EV penetration, flex fuel vehicles remain the most important private passenger transportation alternative, running mostly on a blend of 70% gasoline (containing 27.5% anhydrous ethanol) and 30% hydrated ethanol.7 In all mitigation scenarios, electrifica- tion of the LDV fleet begins in 2035, with motorcycles and taxis replaced by their electric counterparts. The higher conversion efficiency of EVs causes a significant drop in energy consumption to meet passenger transportation services demand. On an energy basis, EVs account for 25% of passenger private transportation in 2050, increasing electricity demand with implications for power generation (Section 3.5), and reductions in ethanol and gasoline consumption. Implications of these results are addressed in depth in the discussion section (see also SOM Section 1.4.1). Passenger public transport continues to be done by diesel ICE buses, but the increasing share of BTL-diesel in the fuel mix means emissions stabilize. Transportation emissions peak in 2030 and begin to drop as electricity and biofuels gain space in the energy mix of the sector. Total passenger emissions peak in 2030.Stringent scenarios bring higher use of highly specified drop-in BTL biofuels,8 produced with and without CCS (Section 3.6) and blended into the diesel and kerosene pools. This effectively makes diesel and kerosene low-carbon fuels, allowing them to maintain their share in the fuel mix of passenger transportation sector (Fig. 4b). The same occurs in freight transportation, where fuel types remains largely unchanged from the Ref scenario in 2050.4 Discussion Countries are currently preparing to submit revised NDCs in 2020, and the expectation is to ratchet up ambition to close the emissions gap and put the world on track to fulfill PA goals to curb climate change. In addition, Article 4 of the Agreement invited parties to submit, by 2020, long-term GHG emission strategies known as “mid-century strategies.” This paper examined how specific targets of the Brazilian NDC compare to current trends and to more ambitious scenarios to 2050 consistent with global efforts to limit climate change to well-below 2 °C compared with the pre-industrial era. Higher ambition was implemented in the BLUES model as tight emissions budgets equivalent to 15 years of the country’s 2010-level CO2 emissions for a 2 °C global temperature target and to 10 years of 2010 emissions for a 1.5 °C global target. Although it can be argued that these targets go beyond what may be considered a fair 7 Flex vehicles are modeled as operating in two modes: in option 1, the ratio gasoline/ethanol is 30/70, and in option 2 70/30. Option 2 dominates in all scenarios modeled here. Because BLUES models gasoline as blended with anhydrous ethanol at 27.5% by volume, average flex vehicle consumption is 50/50 {0.7*(1– 0.275) = 0.5075}. 8 Drop-in biofuels are highly specified 2nd generation biofuels that can be injected directly into the fuel without any alteration of the engine. nan Climatic Change (2020) 162:1823–1842 contribution from Brazil under other effort-sharing allocation criteria (van den Berg et al. 2019, this issue), this allows exploration of the country’s potential to ratchet up its contribution to the global effort under the PA. Halting deforestation is the main challenge for Brazilian climate action. Full implementa- tion of the Forest Code by 2030 implies afforestation on more than 30 Mha of land which, for the period of analysis, would more than compensate for deforestation pre-2030, effectively delivering on net-zero deforestation. Brazil already boasts a low-emissions energy system with high share of hydroelectricity in power generation and significant penetration of biofuels (ethanol and biodiesel) in liquid fuels.However, rising demand for energy services will drive expansion of energy supply capacity across sectors, which, in the Ref scenario, is met by increasing fossil fuel consumption. In the mitigation scenarios, the stringent constraints on emissions increase the value of negative emissions technologies (NETs), which include afforestation and BECCS in the current version of BLUES. Our results suggest current policies in Brazil are only partially on track to meet the NDC. For AFOLU targets, the Ref scenario approaches the NDC target area for pasture recuperation by 2030 but falls short of the targets for integrated systems and planted forests, suggesting further action may be required. There is also only partial attainment of energy targets, with share of bioenergy well exceeding the 18% of PEC as pledged in the NDC, but the share of non-hydro renewables falling short of the 33% target by 2030. To further reduce the emissions intensity of Brazil’s energy system, some innovative technologies are deployed at scale, especially in the livestock production (integrated systems) and biofuels (FT-BTL) sectors. The agricultural sector can play a central role in Brazil’s future in a low-carbon world. In the mitigation scenarios explored here, a revolution in livestock production leads to a shift towards high productivity livestock systems that break with the old expansionist approach that has driven deforestation in the past. Pasture recuperation and improved management can substantially increase livestock productivity, driving a shift from low- to high-capacity pas- tures as well as an increase in integrated crop-livestock-forestry systems (Figs. 2 and S7). This enables carbon sequestration not only in agricultural soils but also from forest area expansion (Fig. S8) and from the deployment of BECCS (Figs. 3 and 4a) which could make Brazil CO2- negative around 2040, despite non-CO2 gases meaning the country remains a net GHG emitter through 2050 (Fig. 1). However, although agriculture intensification can spare land for regrowth of natural vegetation (afforestation) and bioenergy production, there is evidence that intensification of agriculture may also increase land rents which may lead to further expansion of the agricultural area, increasing deforestation (Nepstad et al. 2009; Rose et al. 2013).In our results, the improved agricultural production techniques enable decarbonization of energy sectors via deployment of various forms of bioenergy, mainly sugarcane and lignocel- lulosic feedstocks. Sugarcane yields ethanol from its juice and bioelectricity from bagasse and both make large contributions in mitigation scenarios. Technical upgrades such as higher efficiency boilers in sugar and ethanol plants raise productivity and produce more electricity with less bagasse. This well-known potential efficiency improvement in Brazil is not realized today due to financial uncertainties but could be spurred with introduction of carbon revenues. First generation ethanol from sugarcane peaks around 2030 and is present through 2050 across scenarios, albeit with CCS in mitigation scenarios. This form of BECCS- liquids begins as early as 2035 but is gradually reduced due to the introduction of 2nd generation ethanol (Fig. 4a) and electrification of the LDV fleet (Fig. 4b). A more substantial contribution from liquid biofuels comes in the form of biodiesel and biokerosene with and without CCS. The lack of mature options in freight and aviation nan Climatic Change (2020) 162:1823–1842 means decarbonization of these sectors relies on bioenergy (Section 3.7), mainly from FT-BTL routes using lignocellulosic feedstock. These results point to important dynamics between (i) electrification of the LDV fleet, (ii) biofuels production and use, and (iii) land use intensification. Each has implications not only for each other but also for the country’s emissions profile and for future development of its energy-infrastructure complex. This has repercussions all the way down to the primary energy level, as seen in Fig. 3. Decarbonizing the transportation sector gives rise to these inter-sector ripple effects in energy and AFOLU sectors. These linkages are mediated by the transportation sector via biofuels, which link the AFOLU, transportation, refining, and power generation sectors. For example, sugarcane ethanol is currently used for passenger vehicles while bagasse from crushed sugarcane is burned to generate CO2-neutral9 electricity. This, coupled with large shares of hydropower, implies low-carbon electricity, which favors introduction of EVs as a mitigation option. However, higher share of EVs reduces demand for light liquid fuels, affecting the refining sector.These dynamics are subject to cost and efficiency assumptions and model results need to be interpreted with care. Nonetheless, it points to specific areas where well-designed policy can have positive impacts across sectors, reducing trade-offs and enhancing synergies. Across budget scenarios, biodiesel supplies between 68 and 73% of diesel demand in 2050, meaning refineries still have to produce some fossil diesel from crude. Due to the nature of the refining process, refineries produce some gasoline when running for diesel production, unless expensive processing units are added. This gasoline byproduct comes at a null cost and is used in spite of stringent carbon budgets. Generally, if one of the oil products remains in high demand (due to low elasticity of substitution), refineries will still produce a basket of products at a minimum level at null cost, reducing potential mitigation from their alternatives. In these results, declining refinery activity also means the model must cover residual demand for maritime bunker fuel by importing heavy fuel oil. Coupled with CCS, both bioelectricity and biofuels have the potential for significant negative emissions, which contribute to meeting the stringent emissions budgets explored in this study. As is the case with most IAMs, the value of BECCS in BLUES is driven by model structure and assumptions and also by what is not represented in the model such as governance structures, water use, or other advanced energy production routes such as power-to-liquids or power-to-hydrogen (Köberle 2019). The levels of BECCS deployment projected here will require proper governance of the whole bioenergy chain, from the production phase to final consumption and sequestration of captured CO2. Monitoring for land use and land use change emissions will need to be robust enough to prevent undesirable consequences from bioenergy feedstock production, especially with regard to prevention of deforestation, sustainable water use, and biodiversity conservation (Fajardy et al. 2019). The dynamics described here have implications for the attainment of the SDGs. As noted in Section 3.3, cultivated area increases in the short-term at the expense of natural lands, especially in the biodiversity-rich Cerrado biome of central Brazil (savannas in BLUES).This implies more deforestation to meet demands for food, fiber, and bioenergy, with potential negative impacts on biodiversity. In mitigation scenarios, deforestation peaks between 2025 and 2030, and forests begin to recover some of the lost area post-2030 (Fig. S8). This indicates that PA targets may be consistent with nature conservation in the long run but pose serious 9 Bioelectricity from sugarcane is the result of burning bagasse, a by-product of sugar or ethanol production. Because bagasse is in fact a residue of the main activity, emissions should be allocated to the other products. nan Climatic Change (2020) 162:1823–1842 threats to the attainment of SDGs by 2030, especially those related to land use, such as biodiversity (SDG 15) and food security (SDG2). Intensification of agriculture and livestock has mixed impacts on SDGs. On the one hand, recuperation of degraded pastures may well have a positive net effect since a small addition of inputs (diesel and fertilizer) may raise productivity, potentially leading to land sparing. On the other, attaining higher yield for crops may have adverse effects through increased use of diesel and fertilizers—impacting emissions (SDG13) and water quality (SDG 14), as well as through the potential need to deploy genetically modified cultivars (through genetically modified organisms—GMOs)—with potentially adverse effects on biodiversity. The net effects of climate mitigation on SDGs are uncertain and beyond the scope of the current analysis. However, for the case of Brazil, these results identify important indicators like forest area and fertilizer use that suggest challenges for the concurrent achievement of the PA and other sustainable development objectives. Such challenges can only be overcome through the implementation of well-designed policy that takes into account the cross-cutting and interrelated repercussions of individual measures. Limitations of this study include uncertainty as to the assumptions in input parameters of the BLUES model (Krey et al. 2019a). However, the complex interactions between bioelec- tricity and other power generation options, biofuels, the transportation sector, land use, and agriculture restrict the benefit of simplistic sensitivity analyses on cost parameters.Indeed, understanding the effects of cost assumptions of the various technologies represented in the BLUES model requires careful design of scenarios to test the sensitivity of the results to the input assumptions of the model. Such a sensitivity analysis is beyond the scope of this study and is reported elsewhere (Köberle et al. 2018). Nonetheless, a discussion on sensitivity tests conducted during the design of the scenarios reported here can be found in SOM Section S1.5.5 Conclusions This paper used the BLUES model to examine potential GHG mitigation options for Brazil in the context of the PA and SDGs. Results indicate that current policies are on track to only partially deliver the pledges in the Brazilian NDC by 2030, but additional policies to meet the NDC would also put the country on a least-cost pathway consistent with global efforts to attain PA objectives. Key measures include net-zero deforestation post-2030, sustainable intensifi- cation of agriculture, electrification of the LDV fleet, and decarbonization of freight transpor- tation and aviation via advanced BTL biofuels production with and without CCS. Results indicate key linkages between AFOLU, transportation, and energy sectors. They point to the fundamental role of AFOLU in Brazil’s mitigation efforts, with its emissions becoming negative before those of the energy sector. Intensification of currently extensive agricultural practices allows for bioenergy feedstock production while curbing deforestation and, in some cases, even allowing for afforestation. Bioenergy production links the land use and agriculture sectors to the energy sectors, especially transportation and power generation. This implies successful mitigation policies relying on bioenergy would need to take a systemic view of the supply chain from the agricultural phase to final consumption and sequestration of combustion CO2. Halting deforestation is the main challenge for Brazilian climate action and full implemen- tation of the Forest Code implies net-zero deforestation through 2050. With no deforestation, the land area required to grow the feedstock comes from sustainable intensification of nan Climatic Change (2020) 162:1823–1842 agriculture, especially of livestock production. Recuperation of degraded pastures and intro- duction of integrated crop–livestock–forestry systems meet demand for agricultural products using less land, with the added benefit of reducing emissions relative to current practices. In the energy sector, mitigation measures include low-carbon sources for all energy carriers, fuel switch in transportation, energy efficiency in industry and transportation, and transitions to low-carbon power generation from biomass, wind, and solar. Brazil’s high bioenergy potential makes negative emissions through BECCS a realistic option.The transportation sector stands out as having a significant potential for emissions reductions through the use of biofuels, with and without CCS,10 and the electrification of the LDV passenger fleet. Power generation is already low-carbon, meaning passenger transportation can be decarbonized through electrifi- cation. However, there are limited options to decarbonize freight transportation and aviation and these stand out as prime candidates for enhanced climate action in the country. To that end, results point to biodiesel and biokerosene made from lignocellulosic feedstock via FT synthesis as an optimal alternative. These dynamics have mixed implications for the attainment of the SDGs. In mitigation scenarios, deforestation peaks between 2025 and 2030, and forests begin to recover some of the lost area post-2030. This indicates climate action in Brazil to be consistent with the SDGs in the long-run despite some short-term challenges up to 2030. The levels of BECCS deployment projected here will require proper governance of the whole bioenergy chain and monitoring for land use and land use change emissions will need to be robust enough to prevent undesirable consequences from bioenergy feedstock production. The interlinked, cross-sectoral measures explored here require a systems approach to policy design to minimize trade-offs and maximize synergies across sectors. Acknowledgements The authors would also like to express their gratitude to the Conselho Nacional de Desenvolvimento Cientifico e Tecnológico (National Scientific and Technological Development Council—CNPq) for the essential support given for this work to be carried out. Funding This work is part of a project that has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 642147 (CD-LINKS). Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. 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UN Framew Convention on CLimate Chenage (UNFCCC), Paris, France. FCCC/CP/2015/L.9/Rev.1 van den Berg NJ, van Soest HL, Hof AF, den Elzen MGJ, van Vuuren DP, Chen W, Drouet L, Emmerling J, Fujimori S, Höhne N, Kõberle AC, McCollum D, Schaeffer R, Shekhar S, Vishwanathan SS, Vrontisi Z, Blok K (2019) Implications of various effort-sharing approaches for national carbon budgets and emission pathways. Clim Chang. https://doi.org/10.1007/s10584-019-02368-y von Stechow C, Minx JC, Riahi K, Jewell J, McCollum DL, Callaghan MW, Bertram C, Luderer G, Baiocchi G (2016) 2 °C and SDGs: united they stand, divided they fall? Environ Res Lett 11:34022. https://doi.org/10.1088/1748-9326/11/3/034022 Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.Affiliations Alexandre C. Köberle1,2 & Pedro R. R. Rochedo1 & André F. P. Lucena1 & Alexandre Szklo1 & Roberto Schaeffer1 1 Centre for Energy and Environmental Economics-CENERGIA, Energy Planning Program, Graduate Schoo of Engineering, Universidade Federal do Rio de Janeiro, Centro de Tecnologia, Bloco C, Sala 211 Cidad Universitária, Ilha do Fundão, Rio de Janeiro, RJ 21941-972, Brazil 1 Centre for Energy and Environmental Economics-CENERGIA, Energy Planning Program, Graduate School of Engineering, Universidade Federal do Rio de Janeiro, Centro de Tecnologia, Bloco C, Sala 211 Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ 21941-972, Brazil 2 Grantham Institute, Imperial College London, London SW7 2AZ, UK nantable_1Engenharia Agrícola ISSN: 1809-4430 (on-line) www.engenhariaagricola.org.brSpecial Issue: Energy in Agriculture Scientific Paper Doi: http://dx.doi.org/10.1590/1809-4430-Eng.Agric.v43nepe20220160/2023 f p oi: http://dx.doi.org/10.1590/1809-4430-Eng.Agric.v43nepe20220160/2023GEOTHERMAL ENERGY: AN ALTERNATIVE TO THE WATER–ENERGY DILEMMA IN NORTHEASTERN BRAZIL Francisco T. G. Lima Verde Neto1, Paulo A. C. Rocha1, Jenyffer da S. G. 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