References
- [1] European Commission, Communication From The Commission To The European Parliament And The Council. Sustainable Carbon Cycles., Brussels, 2021.
- [2] Dolge K., Blumberga D. Key Factors Influencing the Achievement of Climate Neutrality Targets in the Manufacturing Industry: LMDI Decomposition Analysis. Energies 2021:14(23):8006. https://doi.org/10.3390/EN1423800610.3390/en14238006
- [3] Kuramochi T., Ramírez A., Turkenburg W., Faaij A. Effect of CO2 capture on the emissions of air pollutants from industrial processes. Int. J. Greenh. Gas Control 2012:10:310–328. https://doi.org/10.1016/j.ijggc.2012.05.02210.1016/j.ijggc.2012.05.022
- [4] Gardarsdottir S. O., Normann F., Andersson K., Johnsson F. Process evaluation of CO2 capture in three industrial case studies. Energy Procedia 2014:63:6565–6575. https://doi.org/10.1016/j.egypro.2014.11.69310.1016/j.egypro.2014.11.693
- [5] Kim J., Yu S., Yun S. T., Kim K. H., Shinn Y. J., Chae G. CO2 leakage detection in the near-surface above natural CO2-rich water aquifer using soil gas monitoring. Int. J. Greenh. Gas Control 2019:88:261–271. https://doi.org/10.1016/j.ijggc.2019.06.01510.1016/j.ijggc.2019.06.015
- [6] Cheng J., Dong H., Zhang H., Yuan L., Li H., Yue L., Hua J., Zhou J. Improving CH4 production and energy conversion from CO2 and H2 feedstock gases with mixed methanogenic community over Fe nanoparticles. Bioresour. Technol. 2020:314:123799. https://doi.org/10.1016/j.biortech.2020.12379910.1016/j.biortech.2020.12379932673781
- [7] Yang Z. Z., He L. N., Gao J., Liu A. H., Yu B. Carbon dioxide utilization with C-N bond formation: Carbon dioxide capture and subsequent conversion. Energy Environ. Sci. 2012:5:6602–6639. https://doi.org/10.1039/c2ee02774g10.1039/c2ee02774g
- [8] Murcia Valderrama M. A., van Putten R. J., Gruter G. J. M. The potential of oxalic – and glycolic acid based polyesters (review). Towards CO2 as a feedstock (Carbon Capture and Utilization – CCU). Eur. Polym. J. 2019: 119:445–468. https://doi.org/10.1016/j.eurpolymj.2019.07.03610.1016/j.eurpolymj.2019.07.036
- [9] Muthuraj R., Mekonnen T. Recent progress in carbon dioxide (CO2) as feedstock for sustainable materials development: Co-polymers and polymer blends. Polymer 2018:145:348–373. https://doi.org/10.1016/j.polymer.2018.04.07810.1016/j.polymer.2018.04.078
- [10] Bai H., Cheng T., Li S., Zhou Z., Yang H., Li J., Xie M., Ye J., Ji Y., Li Y., Zhou Z., Sun S., Zhang B., Peng H. Controllable CO adsorption determines ethylene and methane productions from CO2 electroreduction. Sci. Bull. 2020:66(1):62–68. https://doi.org/10.1016/j.scib.2020.06.02310.1016/j.scib.2020.06.023
- [11] Universities team up with plan to develop low-carbon aviation fuel from recycled CO2 and bio-waste. Renew. Energy Focus 2016:17(2):50–55. https://doi.org/10.1016/j.ref.2016.02.00810.1016/j.ref.2016.02.008
- [12] Adhikari B. M., Truong T., Prakash S., Bansal N., Bhandari B. Impact of incorporation of CO2 on the melting, texture and sensory attributes of soft-serve ice cream. Int. Dairy J. 2020:109:104789. https://doi.org/10.1016/j.idairyj.2020.10478910.1016/j.idairyj.2020.104789
- [13] Di Caprio M. R., Brondi C., Di Maio E., Mosciatti T., Cavalca S., Parenti V., Iannace S., Mensitieri G., Musto P. Polyurethane synthesis under high-pressure CO2, a FT-NIR study. Eur. Polym. J. 2019:115:364–374. https://doi.org/10.1016/j.eurpolymj.2019.03.04710.1016/j.eurpolymj.2019.03.047
- [14] Shijian L., Dongya Z., Quanmin Z. CO2 absorber coupled with double pump CO2 capture technology for coal-fired flue gas. Energy Procedia 2018:154:163–170. https://doi.org/10.1016/j.egypro.2018.11.02710.1016/j.egypro.2018.11.027
- [15] European Comission, Technical Guidance Handbook: Setting up and implementing results-based carbon farming mechanisms in the EU (2021), Brussel, 2021.
- [16] Gancone A., Pubule J., Blumberga D. Valorization methodology for agriculture sector climate change mitigation measures. Environ. Clim. Technol. 2021:25(1):944–954. https://doi.org/10.2478/rtuect-2021-007110.2478/rtuect-2021-0071
- [17] European Comission. The European Green Deal.
- [18] Sujatha M. P., Lathika C., Smitha J. K. Sustainable and efficient utilization of weed biomass for carbon farming and productivity enhancement: A simple, rapid and ecofriendly approach in the context of climate change scenario, Environ. Challenges. 2021:4:100150. https://doi.org/10.1016/J.ENVC.2021.10015010.1016/j.envc.2021.100150
- [19] Van Eck N. J., Waltman L. VOSviewer Manual version 1.6.10, CWTS Meaningful Metrics. 2019.
- [20] LVĢMC. 2020. gadā iesniegtās siltumnīcefekta gāzu inventarizācijas kopsavilkums. (Summary of the greenhouse gas inventory submitted in 2020). ([Online]. [Accessed: 18 January 2021]. Available: https://www.meteo.lv/fs/CKFinderJava/userfiles/files/Vide/Klimats/Majas_lapai_LVGMC_2020_seginvkopsavilkums.pdf (In Latvian).
- [21] IPCC, IPCC – Task Force on National Greenhouse Gas Inventories, 2. 2006. [Online]. [Accessed: 20 April 2020]. Available: https://www.ipcc-nggip.iges.or.jp/public/2006gl/
- [22] CSP. Latvia’s energy balance in 2017. (Latvijas energobilance 2017. gadā). 2018. [Online]. [Accessed: 20 April 2020]. Available: www.csb.gov.lv (In Latvian).
- [23] Allen J. John Deere develops fully electric, autonomous tractor | Industrial Vehicle Technology International. [Online]. [Accessed: 20 April 2020]. Available: https://www.ivtinternational.com/news/agriculture/john-deeredevelops-fully-electric-autonomous-tractor.html
- [24] Blanco-Canqui H. Crop Residue Removal for Bioenergy Reduces Soil Carbon Pools: How Can We Offset Carbon Losses? Bioenergy Res. 2013:6:358–371. https://doi.org/10.1007/s12155-012-9221-310.1007/s12155-012-9221-3
- [25] Šarauskis E., Buragiene S., Masilionyte L., Romaneckas K., Avižienyte D., Sakalauskas A. Energy balance, costs and CO2 analysis of tillage technologies in maize cultivation. Energy 2014:69:227–235. https://doi.org/10.1016/j.energy.2014.02.09010.1016/j.energy.2014.02.090
- [26] Hoffman E., Cavigelli M. A., Camargo G., Ryan M., Ackroyd V. J., Richard T. L., Mirsky S. Energy use and greenhouse gas emissions in organic and conventional grain crop production: Accounting for nutrient inflows. Agric. Syst. 2018:162:89–96. https://doi.org/10.1016/j.agsy.2018.01.02110.1016/j.agsy.2018.01.021
- [27] Augšņu degradācijas procesu, augsni saudzējošu lauksaimniecības paņēmienu un ar augsni saistītu politikas pasākumu sasaiste (Linking soil degradation processes, soil-conserving agricultural practices and soil-related policies). [Online]. [Accessed: May 1, 2020]. Available: https://esdac.jrc.ec.europa.eu/projects/SOCO/FactSheets/LVFactSheet.pdf
- [28] Sørensen C. G., Nielsen V. Operational analyses and model comparison of machinery systems for reduced tillage, Biosyst. Eng. 2005:92(2):143–155. https://doi.org/10.1016/j.biosystemseng.2005.06.01410.1016/j.biosystemseng.2005.06.014
- [29] Saldukaitė L., Šarauskis E., Lekavičienė K., Savickas D. Predicting energy efficiency and greenhouse gases reduction potential under different tillage management and farm size scenarios for winter wheat production. Sustain. Energy Technol. Assessments 2020:42:42100841. https://doi.org/10.1016/j.seta.2020.10084110.1016/j.seta.2020.100841
- [30] Tabatabaeefar A., Emamzadeh H., Varnamkhasti M. G., Rahimizadeh R., Karimi M. Comparison of energy of tillage systems in wheat production. Energy 2009:34(1):41–45. https://doi.org/10.1016/j.energy.2008.09.02310.1016/j.energy.2008.09.023
- [31] Miltiņš R. Swedbank Business Network. Jaunās tehnoloģijas lauksaimniecībā = domāšanas maiņa. (New technologies in agriculture = change in thinking). [Online]. [Accessed January 18, 2021]. Available: https://businessnetwork.lv/ievads/izaugsme/raimonds-miltins-lauksaimniecibas-tehnologijas-53066 (In Latvian).
- [32] Bumbiere K., Pubule J., Blumberga D. What Will Be the Future of Biogas Sector? Environ. Clim. Technol. 2021:25(1):295–305. https://doi.org/10.2478/RTUECT-2021-002110.2478/rtuect-2021-0021
- [33] Latvijas Vides, Ģeoloģijas un Meteoroloģijas Centrs. 2022. gada siltumnīcefekta gāzu inventarizācijas kopsavilkums. Versija: Iesniegts ANO Vispārējai konvencijai par klimata pārmaiņām. (Center of Environment, Geology and Meteorology of Latvia. 2022 Greenhouse Gas Inventory Summary. Version: Submitted to the UN Framework Convention on Climate Change). [Online]. [Accessed: 15.04.2022}. Available: https://videscentrs.lvgmc.lv/files/Klimats/SEG_emisiju_un_ETS_monitorings/Zinojums_par_klimatu/Iesniegto_SEG_prognozu_kopsavilkumi/Majas_lapai_LVGMC_2021_segprognozes.pdf
- [34] Indzere Z., Kubule A., Zihare L., Vamza I., Blumberga D. Analysis of Bioeconomy Affeting Factors - Climate Change and Production. Env. Clim. Technol. 2021:25(1):1293–1304. https://doi.org/10.2478/rtuect-2021-009810.2478/rtuect-2021-0098
- [35] Yong Z. J., Bashir M. J. K., Hassan M. S. Biogas and biofertilizer production from organic fraction municipal solid waste for sustainable circular economy and environmental protection in Malaysia. Sci. Total Environ. 2021:776:145961. https://doi.org/10.1016/j.scitotenv.2021.14596110.1016/j.scitotenv.2021.14596133640552
- [36] Timonen K., Sinkko T., Luostarinen S., Tampio E., Joensuu K. LCA of anaerobic digestion: Emission allocation for energy and digestate. J. Clean. Prod. 2019:235:1567–1579. https://doi.org/10.1016/j.jclepro.2019.06.08510.1016/j.jclepro.2019.06.085
- [37] Gancone A., Bumbiere K., Pubule J., Blumberga D. Sustainable biogas application in energy sector. IEEE. 2020. 10.1109/RTUCON51174.2020.931659310.1109/RTUCON51174.2020.9316593
- [38] Wilken D., Strippel F., Hofmann F., Maciejczyk M., Klinkmüller L., Wagner L., Bontempo G., Münch J., Scheidl S., Conton M., Deremince B., Walter R., Zetsche N., Findeisen C. Biogas to Biomethane, Unido. 2017. [Online]. [Accessed February 23, 2021]. Available: https://issuu.com/fachverband.biogas/docs/btb
- [39] Blumberga D., Dzene I., Al Sedi T., Rucs D., Prasls H., Ketners M. Finstervalders T., Folka S. Biogas: Handbook. 2009. https://ortus.rtu.lv/science/en/publications/5847
- [40] Brémond U., Bertrandias A., Steyer J. P., Bernet N., Carrere H. A vision of European biogas sector development towards 2030: Trends and challenges. J. Clean. Prod. 2021:287. https://doi.org/10.1016/j.jclepro.2020.12506510.1016/j.jclepro.2020.125065
- [41] Latvijas Biogāzes asociācija. (Latvian association of biogas). [Online]. [Accessed February 23, 2021]. Available: http://www.latvijasbiogaze.lv/ (In Latvian).
- [42] Meyer A. K. P., Ehimen E. A., Holm-Nielsen J. B. Future European biogas: Animal manure, straw and grass potentials for a sustainable European biogas production. Biomass and Bioenergy 2018:111:154–164. https://doi.org/10.1016/j.biombioe.2017.05.01310.1016/j.biombioe.2017.05.013
- [43] Kaldis F., Cysneiros D., Day J., Karatzas KAG., Chatzifragkou A. Anaerobic Digestion of Steam-Exploded Wheat Straw and Co-Digestion Strategies for Enhanced Biogas Production. App. Sc. Basel. 2020:10:22.10.3390/app10228284
- [44] Muizniece I., Zihare L., Pubule J., Blumberga D. Circular Economy and Bioeconomy Interaction Development as Future for Rural Regions. Case Study of Aizkraukle Region in Latvia. Environ. Clim. Technol. 2019:23(3):129–146. https://doi.org/10.2478/rtuect-2019-008410.2478/rtuect-2019-0084
- [45] Lauka D., Slisane D., Ievina L., Muizniece I., Blumberga D. When Bioeconomy Development Becomes a Biomass Energy Competitor. Environ. Clim. Technol. 2019:23(3):347–359. https://doi.org/10.2478/rtuect-2019-010010.2478/rtuect-2019-0100
- [46] Zihare L., Spalvins K., Blumberga D. Multi criteria analysis for products derived from agro-industrial by-products. Energy Procedia 2018:147:452–457. https://doi.org/10.1016/j.egypro.2018.07.04510.1016/j.egypro.2018.07.045
- [47] Esteves E. M. M., Herrera A. M. N., Esteves V. P. P., Do R. V. Morgado C. Life cycle assessment of manure biogas production: A review. Journal of Cleaner Production 2019:219:411–423. https://doi.org/10.1016/j.jclepro.2019.02.09110.1016/j.jclepro.2019.02.091
- [48] EMEP. EEA. Atskaites ziņojums un tehniski ekonomiskais pamatojums ‘Biogāzes attīstības iespējas Madonas rajonā’. (Reference report and technical-economic justification ‘Biogas development opportunities in Madona district’) 2019. (In Latvian).
- [49] Cavinato C., Fatone F., Bolzonella D., Pavan P. Thermophilic anaerobic co-digestion of cattle manure with agrowastes and energy crops: Comparison of pilot and full scale experiences. Bioresour. Technol 2010:101(2):545–550. https://doi.org/10.1016/j.biortech.2009.08.04310.1016/j.biortech.2009.08.04319747821
- [50] Shah F. A., Mahmood Q., Rashid N., Pervez A., Raja I. A., Shah M. M. Co-digestion, pretreatment and digester design for enhanced methanogenesis. Renew. Sustain. Energy Rev. 2015:42:627–642. https://doi.org/10.1016/j.rser.2014.10.05310.1016/j.rser.2014.10.053
- [51] Bumbiere K., Gancone A., Pubule J., Kirsanovs V., Vasarevicius S., Blumberga D. Ranking of Bioresources for Biogas Production. Environ. Clim. Technol. 2020:24(1):368–377. https://doi.org/10.2478/RTUECT-2020-002110.2478/rtuect-2020-0021
- [52] Biogāzes enerģija. LAEF. (Biogas energy). [Online]. [Accessed: January 3, 2020]. Available: https://www.laef.lv/lv/biogaze/
- [53] Baumber A., Metternicht G., Cross R., Ruoso L. E., Cowie A. L., Waters C. Promoting co-benefits of carbon farming in Oceania: Applying and adapting approaches and metrics from existing market-based schemes. Ecosyst. Serv. 2019:39:100982. https://doi.org/10.1016/J.ECOSER.2019.10098210.1016/j.ecoser.2019.100982
- [54] EC courtesy translation LV NECP NATIONAL ENERGY AND CLIMATE PLAN OF LATVIA 2021–2030, n.d.
- [55] Decarbonisation Pathways – Eurelectric – Powering People. [Online]. [Accessed: March 4, 2021]. Available: https://www.eurelectric.org/decarbonisation-pathways/
- [56] Scarlat N., Dallemand J. F., Fahl F. Biogas: Developments and perspectives in Europe. Renew. Energy 2018:129:457–472. https://doi.org/10.1016/j.renene.2018.03.00610.1016/j.renene.2018.03.006
- [57] Yu Q., Liu R., Li K., Ma R. A review of crop straw pretreatment methods for biogas production by anaerobic digestion in China. Renewable and Sustainable Energy Reviews 2019:107:51–58. https://doi.org/10.1016/j.rser.2019.02.02010.1016/j.rser.2019.02.020
- [58] Fernández-González J. M., Martín-Pascual J., Zamorano M. Biomethane injection into natural gas network vs composting and biogas production for electricity in Spain: An analysis of key decision factors. Sustain. Cities Soc. 2020:60:102242. https://doi.org/10.1016/j.scs.2020.10224210.1016/j.scs.2020.102242
- [59] Hosseinipour S. A., Mehrpooya M. Comparison of the biogas upgrading methods as a transportation fuel. Renew. Energy 2019:130:641–655. https://doi.org/10.1016/j.renene.2018.06.08910.1016/j.renene.2018.06.089
- [60] Li H., Mehmood D., Thorin E., Yu Z. Biomethane Production Via Anaerobic Digestion and Biomass Gasification. Energy Procedia 2017:105:1172–1177. https://doi.org/10.1016/j.egypro.2017.03.49010.1016/j.egypro.2017.03.490
- [61] Khan I. Waste to biogas through anaerobic digestion: Hydrogen production potential in the developing world - A case of Bangladesh. Int. J. Hydrogen Energy 2020:45(32):15951–15962. https://doi.org/10.1016/j.ijhydene.2020.04.03810.1016/j.ijhydene.2020.04.038
- [62] Kim C., Kim J., Joo S., Bu Y., Liu M., Cho J., Kim G. Efficient CO2 Utilization via a Hybrid Na- CO2 System Based on CO2 Dissolution. IScience 2018:9:278–285. https://doi.org/10.1016/j.isci.2018.10.02710.1016/j.isci.2018.10.027625836530447646
- [63] Lecker B., Illi L., Lemmer A., Oechsner H. Biological hydrogen methanation – A review. Bioresour. Technol. 2017:245:1220–1228. https://doi.org/10.1016/j.biortech.2017.08.17610.1016/j.biortech.2017.08.17628893503
- [64] Liquid Hydrogen Outline. [Online]. [Accessed: August 27, 2020]. Available: https://www.idealhy.eu/index.php?page=lh2_outline
- [65] Encyclopedia of Soils in the Environment. ScienceDirect. [Online]. [Accessed: April 13, 2022]. Available: https://www-sciencedirect-com.resursi.rtu.lv/referencework/9780123485304/encyclopedia-of-soils-in-theenvironment
- [66] Buschmann A. H., Chopin T., Neori A., Halling C., Troell M., Hernández-González M. C., Aranda C. Ecological engineering in aquaculture: towards a better waste management in Western World mariculture. Encycl. Ecol. 2008:2463–2475. https://doi.org/10.1016/B978-008045405-4.00065-310.1016/B978-008045405-4.00065-3
- [67] Jamnadass R., Langford K., Anjarwalla P., Mithöfer D. Public–Private Partnerships in Agroforestry. Encycl. Agric. Food Syst. 2014:544–564. https://doi.org/10.1016/B978-0-444-52512-3.00026-710.1016/B978-0-444-52512-3.00026-7
- [68] Eddy W. C., Yang W. H. Improvements in soil health and soil carbon sequestration by an agroforestry for food production system. Agric. Ecosyst. Environ. 2022:333:107945. https://doi.org/10.1016/J.AGEE.2022.10794510.1016/j.agee.2022.107945
- [69] Sivanpillai R., Shroder J. F. Biological and Environmental Hazards, Risks, and Disasters. Biol. Environ. Hazards, Risks, Disasters. Elsevier 2015:1–466. https://doi.org/10.1016/C2011-0-07027-810.1016/C2011-0-07027-8
- [70] Agricology. Agroforestry for livestock systems. [Online]. [Accessed: April 13, 2022]. Available: https://www.agricology.co.uk/resources/agroforestry-livestock-systems
- [71] Gupta J., Kumari M., Mishra A., Swati, M. Akram, I. S. Thakur. Agro-forestry waste management. A review. Chemosphere 2022:287:132321. https://doi.org/10.1016/J.CHEMOSPHERE.2021.13232110.1016/j.chemosphere.2021.13232134563778
- [72] TOPSIS method algorithm. Download Scientific Diagram. [Online]. [Accessed: February 29, 2020]. Available: https://www.researchgate.net/figure/TOPSIS-method-algorithm_fig4_253953426
- [73] Roszkowska E. Multi-criteria decision making models by applying the topsis method to crisp and interval data. 2011. [Online]. [Accessed: July 20, 2022]. Available: https://mcdm.ue.katowice.pl/files/papers/mcdm11(6)_11.pdf
- [74] Gancone A., Bumbiere K., Pubule J., Blumberga D. Sustainable biogas application in energy sector. 2020 IEEE 61st Annu. Int. Sci. Conf. Power Electr. Eng. Riga Tech. Univ. RTUCON 2020. https://doi.org/10.1109/RTUCON51174.2020.931659310.1109/RTUCON51174.2020.9316593
- [75] Pielietotās augsnes apstrādes metodes dažāda ekonomiskā lieluma lauku saimniecībās. (Applied methods of soil treatment in farms of different economic sizes). [Online]. [accessed: July 20, 2022]. Available: https://data.stat.gov.lv/pxweb/lv/OSP_OD/OSP_OD__skait_apsek__metodes__laukstrukt_13/LSSA13_VI01.px/table/tableViewLayout1/ (In Latvian).
- [76] KLPSP_projekts_20220118_SFC2021. (Project of Latvian KLPSP strategic plan for 2023–2027). In Latvian.
- [77] Valsts zemes dienests. Zemes sadalījums zemes lietošanas veidos. (State Land Service. Distribution of land in land use types). [Online]. [Accessed: July 20, 2022]. Available: https://www.vzd.gov.lv/lv/zemes-sadalijums-zemeslietosanas-veidos (In Latvian).
- [78] Latvijā plāno atbalstīt vien no atkritumiem ražotu biogāzi, rosinot ražotājus kļūt par sanitāriem. (Latvia plans to support biogas produced only from waste, encouraging producers to become sanitary). [Online]. [Accessed: September 14, 2022]. https://www.la.lv/biogazes-razotajus-rosinas-klut-par-sanitariem (In Latvian).
- [79] Zaļais izrāviens vai jauns OIK? Latvija gatavojas biometāna ražošanai. (Green breakthrough or new OIK? Latvia is preparing for biomethane production). [Online]. [Accessed: September 14, 2022]. Available: https://www.lsm.lv/raksts/zinas/zinu-analize/zalais-izraviens-vai-jauns-oik-latvija-gatavojas-biometanarazosanai.a394764/ (In Latvian).
- [80] Elektriskā jauda un saražotā elektroenerģija no atjaunīgiem energoresursiem – Atjaunīgo energoresursu elektrostaciju veids un Laika periods. (Electric power and produced electricity from renewable energy resources – Type of renewable energy power plants and Time period). [Online]. [Accessed September 14, 2022]. Available: https://data.stat.gov.lv/pxweb/lv/OSP_PUB/START__NOZ__EN__ENA/ENA040/table/tableViewLayout1/ (In Latvian).
- [81] Bumbiere K., Gancone A., Pubule J., Blumberga D. Carbon balance of biogas production from maize in latvian conditions. Agron. Res. 2021:19(1):687–697. https://doi.org/10.15159/AR.21.085
- [82] Dabasgāzes imports un patēriņš (milj. m3) – Rādītāji un Laika periods. (Natural gas import and consumption (million m3) – Indicators and Time period). [Online]. [Accessed September 11, 2022]. Available: https://data.stat.gov.lv/pxweb/lv/OSP_PUB/START__NOZ__EN__ENB/ENB020m/table/tableViewLayout1/ (In Latvian).
- [83] US EPA. Greenhouse Gas Equivalencies Calculator. [Online]. [Accessed September 11, 2022]. https://www.epa.gov/energy/greenhouse-gas-equivalencies-calculator#results
- [84] European Biogas Association. Avoided emissions from biogas and biomethane can lead to a negative carbon footprint. [Online]. [Accessed September 9, 2022]. Available: https://www.europeanbiogas.eu/avoided-emissionsfrom-biogas-and-biomethane-can-lead-to-a-negative-carbon-footprint/ (In Latvian).
- [85] O’Shea R., Lin R., Wall D. M., Browne J. D., Murphy J. D. Using biogas to reduce natural gas consumption and greenhouse gas emissions at a large distillery. Appl. Energy. 2020:279:115812. https://doi.org/10.1016/J.APENERGY.2020.11581210.1016/j.apenergy.2020.115812
- [86] Leppäkoski L., Marttila M. P., Uusitalo V., Levänen J., Halonen V., Mikkilä M. H. Assessing the carbon footprint of biochar from willow grown on marginal lands in Finland. Sustain. 2021:13(18):10097. https://doi.org/10.3390/su13181009710.3390/su131810097
- [87] 2020. gadā iesniegtās siltumnīcefekta gāzu inventarizācijas kopsavilkums. (Summary of the greenhouse gas inventory submitted in 2020). [Online]. [Accessed: September 13, 2022]. Available: https://www.meteo.lv/fs/CKFinderJava/userfiles/files/Vide/Klimats/Majas_lapai_LVGMC_2020_seginvkopsavilkums.pdf (In Latvian).
- [88] Paustian K., Larson E., Kent J., Marx E., Swan A. Soil C Sequestration as a Biological Negative Emission Strategy. Front. Clim. 2019. https://doi.org/10.3389/fclim.2019.0000810.3389/fclim.2019.00008