Recent developments in climate change and growing global carbon dioxide (CO 2 ) emissions requires all countries to significantly intensify their efforts to reduce emissions in the energy sector. Considering this assertion, this study conducts a comparative analysis of some decarbonization strategies adopted by the United States and the European Union to reduce carbon greenhouse gas emissions. Thus, this study derived data from various online data sources to analyze carbon emissions and decarbonization strategies in the U.S. and the European Union. Using curve-fitting models in Microsoft Excel, the study also modeled the average carbon emissions per state and country from 2005 to 2030 for U.S. states and EU countries. Results from the models show a decline in average carbon emissions in the U.S. (from 116 units in 2005 to 83 units by 2030), while emissions in EU countries are projected to increase (from 104.5 to 129.9 metric tons). The focus on these two regions is due to their significant contributions to global greenhouse gas emissions and their advanced decarbonization strategies. That is, the United States has historically relied on coal, petroleum, natural gas, nuclear energy, and renewables for electricity generation with natural gas and renewables becoming the dominant energy sources in recent years. Additionally, the U.S. has also adopted key technologies such as Energy efficiency, industrial electrification, low-carbon fuels, feedstocks, and energy sources (LCFFES), and carbon capture, utilization, and storage (CCUS) to reduce carbon emissions. Comparatively, the EU has seen better performance from nuclear and geothermal energy, while biomass, oil, and large-scale hydropower lag. Also, the EU’s primary decarbonization strategies focus on electrification and carbon-neutral power, energy efficiency, demand-side measures, and circular economy principles. Hence, the study concludes that decarbonizing the energy system is essential for addressing climate change and mitigating the effects of increasing emissions worldwide.
Ahman, M., & Nilsson, L. J. (2015). Decarbonizing Industry in the EU: Climate, Trade and Industrial Policy Strategies. In C. Dupont, & S. Oberthür (Eds.), Decarbonization in the European Union (pp. 92-114). Palgrave Macmillan UK. https://doi.org/10.1057/9781137406835_5
Anderson, A., Lebling, K., Byrum, Z., & Dellesky, C. (2021). A New Industrial Revolution for a Livable Climate. https://www.wri.org/insights/decarbonize-us-industry
Atanasiu, B. (2010). The Role of Bioenergy in the National Renewable Energy Action Plans: A First Identification of Issues and Uncertainties. Biomass Futures. https://ieep.eu/wp-content/uploads/2022/12/bioenergy_in_NREAPs.pdf
Bayer, P., & Aklin, M. (2020). The European Union Emissions Trading System Reduced CO 2 Emissions Despite Low Prices. Proceedings of the National Academy of Sciences, 117, 8804-8812. https://doi.org/10.1073/pnas.1918128117
Berrill, P., Gillingham, K. T., & Hertwich, E. G. (2021). Drivers of Change in US Residential Energy Consumption and Greenhouse Gas Emissions, 1990-2015. Environmental Research Letters, 16, Article ID: 034045. https://doi.org/10.1088/1748-9326/abe325
Berrill, P., Wilson, E. J., Reyna, J. L., Fontanini, A. D., & Hertwich, E. G. (2022). Decarbonization Pathways for the Residential Sector in the United States. Nature Climate Change, 12, 712-718.
Beurskens, L. W. M., & Hekkenberg, M. (2011). Renewable Energy Projections as Published in the National Renewable Energy Action Plans of the European Member States Covering All 27 EU Member States. https://www.ecn.nl/docs/library/report/2010/e10069.pdf
Bigerna, S., & Polinori, P. (2022). Convergence of KAYA Components in the European Union toward the 2050 Decarbonization Target. Journal of Cleaner Production, 366, Article ID: 132950. https://doi.org/10.1016/j.jclepro.2022.132950
Bistline, J. E. T., Bedilion, R., Goteti, N. S., & Kern, N. (2022). Implications of Variations in Renewable Cost Projections for Electric Sector Decarbonization in the United States. iScience , 25, Article ID: 104392. https://doi.org/10.1016/j.isci.2022.104392
Boden, T. A., Marland, G., & Andres, R. J. (2017). National CO2 Emissions from Fossil-Fuel Burning, Cement Manufacture, and Gas Flaring: 1751-2014. Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, US Department of Energy. https://doi.org/10.3334/CDIAC/00001_V2017
Boscán, L. R. (2020). European Union Retail Electricity Markets in the Green Transition: The Quest for Adequate Design. WIREs Energy and Environment, 9, e359. https://doi.org/10.1002/wene.359
Chiaramonti, D. (2019). Sustainable Aviation Fuels: The Challenge of Decarbonization. Energy Procedia, 158, 1202-1207. https://doi.org/10.1016/j.egypro.2019.01.308
Cho, R. (2022). What Is Decarbonization, and How Do We Make It Happen? News.climate.columbia.edu. https://news.climate.columbia.edu/2022/04/22/what-is-decarbonization-and-how-do-we-make-it-happen/
Crutzen, P. J. (2006). Albedo Enhancement by Stratospheric Sulfur Injections: A Contribution to Resolve a Policy Dilemma? Climatic Change, 77, 211-219. https://doi.org/10.1007/s10584-006-9101-y
D’Aprile, P., Engel, H., Helmcke, S., Hieronimus, S., Naucler, T. Pinner, D. & van Gendt, G. (2020). McKinsey Sustainability Report. https://www.mckinsey.com/capabilities/sustainability/our-insights/how-the-european-union-could-achieve-net-zero-emissions-at-net-zero-cost
de Blas, I., Mediavilla, M., Capellán-Pérez, I., & Duce, C. (2020). The Limits of Transport Decarbonization under the Current Growth Paradigm. Energy Strategy Reviews, 32, Article ID: 100543. https://doi.org/10.1016/j.esr.2020.100543
Dupont, C., & Oberthür, S. (2015). Decarbonization in the EU: Setting the Scene. In C. Dupont, & S. Oberthür (Eds.), Decarbonization in the European Union (pp. 1-24). Palgrave Macmillan UK. https://doi.org/10.1057/9781137406835_1
Energy Information Administration (2019). U.S. Renewable Electricity Generation Has Doubled since 2008. https://www.eia.gov/todayinenergy/detail.php?id=38752
European Commission (2023). Climate Action: 2050 Long-Term Strategy. https://climate.ec.europa.eu/eu-action/climate-strategies-targets/2050-long-term-strategy_en
Fay, M., Hallegatte, S., Vogt-Schilb, A., Rozenberg, J., Narloch, U., & Kerr, T. (2015). Decarbonizing Development: Three Steps to a Zero-Carbon Future. The World Bank. https://doi.org/10.1596/978-1-4648-0479-3
Frei, B. (2021). Buildings Consume More than a Third of the EU’s Energy. Here’s How to Decarbonize Them. Weforum.org. https://www.weforum.org/agenda/2021/01/here-s-how-to-decarbonize-the-eu-s-building-stock/
Geden, O., Peters, G. P., & Scott, V. (2019). Targeting Carbon Dioxide Removal in the European Union. Climate Policy, 19, 487-494. https://doi.org/10.1080/14693062.2018.1536600
Haas, T., & Sander, H. (2020). Decarbonizing Transport in the European Union: Emission Performance Standards and the Perspectives for a European Green Deal. Sustainability, 12, Article 8381. https://doi.org/10.3390/su12208381
Hsu, D., Andrews, C. J., T. Han, A., G. Loh, C., C. Osland, A., & P. Zegras, C. (2022). Planning the Built Environment and Land Use Towards Deep Decarbonization of the United States. Journal of Planning Literature, 38, 426-441. https://doi.org/10.1177/08854122221097977
Hultman, N. E., Clarke, L., Frisch, C., Kennedy, K., McJeon, H., Cyrs, T. et al. (2020). Fusing Subnational with National Climate Action Is Central to Decarbonization: The Case of the United States. Nature Communications, 11, Article No. 5255. https://doi.org/10.1038/s41467-020-18903-w
International Energy Agency (2021). Data and Statistics. IEA. https://www.iea.org/data-andstatistics?country=USA&fuel=Energy%20supply&indicator=RenewGenBySource
International Renewable Energy Agency (2020). Renewable Energy Statistics 2020. IRENA. https://www.irena.org/-/media/Files/IRENA/Agency/Publication/2020/Jul/IRENA_Renewable_Energy_Statistics_2020.pdf
IPCC (2018). “Glob al Warming of 1.5 ˚C .” IPCC Special Report. Intergovernmental Panel on Climate Change (IPCC). https://www.ipcc.ch/sr15/
Jackson, R. B., Le Quéré, C., Andrew, R. M., Canadell, J. G., Korsbakken, J. I., Liu, Z. et al. (2018). Global Energy Growth Is Outpacing Decarbonization. Environmental Research Letters, 13, Article ID: 120401. https://doi.org/10.1088/1748-9326/aaf303
Kanoh, T. (1992). T oward Dematerialization and Decarbonization. International Institute for Applied Systems Analysis.
Karakosta, C. (2016). The Role of Industrial Emissions within the European Union: Trends and Policy. Climate Policy Info Hub, 28 June 2016. http://climatepolicyinfohub.eu/role-industrial-emissions-within-eu-trends-and-policy
Lawson, A. (2018). Decarbonizing U.S. Power. C2ES.org. https://www.c2es.org/document/decarbonizing-u-s-power/
Lefèvre, J., Briand, Y., Pye, S., Tovilla, J., Li, F., Oshiro, K. et al. (2021). A Pathway Design Framework for Sectoral Deep Decarbonization: The Case of Passenger Transportation. Climate Policy, 21, 93-106. https://doi.org/10.1080/14693062.2020.1804817
Lenschow, A., & Sprungk, C. (2010). The Myth of a Green Europe. JCMS: Journal of Common Market Studies, 48, 133-154. https://doi.org/10.1111/j.1468-5965.2009.02045.x
Meyer, N. (2018). Decarbonizing U.S. Oil and Gas. C2ES.org. https://www.c2es.org/document/decarbonizing-u-s-oil-and-gas/
Moore, J.W. (2016). The Rise of Cheap Nature. In J. W. Moore (Ed.), Anthropocene or Capitalocene ? Nature, History, and the Crisis of Capitalism (pp. 78-115). PM Press.
Myllyvirta, L. (2022). Analysis: EU’s CO 2 Emissions Fall 5% in Three Months after Post-Covid Surge. Carbonbrief.org. https://www.carbonbrief.org/analysis-eus-co2-emissions-fall-5-in-three-months-after-post-covid-surge/
Oberthür, S. (2016). Where to Go from Paris? the European Union in Climate Geopolitics. Global Affairs, 2, 119-130. https://doi.org/10.1080/23340460.2016.1166332
Office of Energy Efficiency & Renewable Energy (2022). DOE Industrial Decarbonization Roadmap. DOE/EE-2635. https://www.energy.gov/eere/doe-industrial-decarbonization-roadmap
Office of Energy Efficiency & Renewable Energy (2023). The U.S. National Blueprint for Transportation Decarbonization: A Joint Strategy to Transform Transportation. DOE/EE-2674. https://www.energy.gov/eere/us-national-blueprint-transportation-decarbonization-joint-strategy-transform-transportation
Papadis, E., & Tsatsaronis, G. (2020). Challenges in the Decarbonization of the Energy Sector. Energy, 205, Article ID: 118025. https://doi.org/10.1016/j.energy.2020.118025
Pavlenko, N. (2021). An Assessment of the Policy Options for Driving Sustainable Aviation Fuels in the European Union. April. International Council on Clean Transportation. https://theicct.org/sites/default/files/publications/Sustainable-aviation-fuel-policy-eu-apr2021.pdf
Pawar, S. (2021). Resil ient Decarbonization for the United States: Lessons for Electric Systems from a Decade of Extreme Weather. https://ceepr.mit.edu/workingpaper/resilient-decarbonization-for-the-united-states-lessons-for
Perissi, I., & Jones, A. (2022). Investigating European Union Decarbonization Strategies: Evaluating the Pathway to Carbon Neutrality by 2050. Sustainability, 14, Article 4728. https://doi.org/10.3390/su14084728
Pietzcker, R. C., Longden, T., Chen, W., Fu, S., Kriegler, E., Kyle, P. et al. (2014). Long-term Transport Energy Demand and Climate Policy: Alternative Visions on Transport Decarbonization in Energy-Economy Models. Energy, 64, 95-108. https://doi.org/10.1016/j.energy.2013.08.059
Porters, S. (2020). The 2030 Decarbonization Challenge. https://www.deloitte.com/global/en/Industries/energy/perspectives/the-2030-decarbonization-challenge.html
Ristic, B., Mahlooji, M., Gaudard, L., & Madani, K. (2019). The Relative Aggregate Footprint of Electricity Generation Technologies in the European Union (EU): A System of Systems Approach. Resources, Conservation and Recycling, 143, 282-290. https://doi.org/10.1016/j.resconrec.2018.12.010
Rockström, J., Gaffney, O., Rogelj, J., Meinshausen, M., Nakicenovic, N., & Schellnhuber, H. J. (2017). A roadmap for rapid decarbonization. Science, 355, 1269-1271. https://doi.org/10.1126/science.aah3443
Sartor, O., Duwe, M., Umpfenbach, K. (2017). Developing 2050 Decarbonization Strategies in the EU. https://www.iddri.org/sites/default/files/import/publications/st0317_eu-2050-long-term-strategies_os-et-al..pdf
Schneer, K. (2019). Decarbonizing the U.S. Economy: House Hearing Reiterates the Urgency of Reaching Zero Emissions by 2050. https://www.eesi.org/articles/view/decarbonizing-the-u.s-economy
Shen, B., Kahrl, F., & Satchwell, A. J. (2021). Facilitating Power Grid Decarbonization with Distributed Energy Resources: Lessons from the United States. Annual Review of Environment and Resources, 46, 349-375. https://doi.org/10.1146/annurev-environ-111320-071618
Siskos, P., Tsiropoulos, I., Karkatsoulis, P., & Capros, P. (2022). Long-term Transport Decarbonization Pathways in the European Union: A Strategic Energy-Economy Analysis. Energy Sources, Part B: Economics, Planning, and Policy, 17, Article ID: 2101712. https://doi.org/10.1080/15567249.2022.2101712
Strielkowski, W., Veinbender, T., Tvaronavičienė, M., & Lace, N. (2020). Economic Efficiency and Energy Security of Smart Cities. Economic Research- Ekonomska Istraživanja , 33, 788-803. https://doi.org/10.1080/1331677x.2020.1734854
Sun, J. W. (2005). The Decrease of CO 2 Emission Intensity Is Decarbonization at National and Global Levels. Energy Policy, 33, 975-978. https://doi.org/10.1016/j.enpol.2003.10.023
Tiseo, I. (2024a). Carbon Dioxide Emissions Worldwide in 2010 and 2021 by Select Country (in Metric Tons). https://www.statista.com/statistics/270499/co2-emissions-in-selected-countries/
Tiseo, I. (2024b). Greenhouse Gas Emissions Per Capita in the European Union 1990-2020. https://www.statista.com/statistics/986460/co2-emissions-per-cap-eu/
Tiseo, I. (2024c). Ca rbon Dioxide Emissions in the European Union from 1965 to 2021. https://www.statista.com/statistics/450017/co2-emissions-europe-eurasia/
U.S. Department of Commerce (2010). U.S. Carbon Dioxide Emissions and Intensities Over Time: A Detailed Accounting of Industries, Government and Households. https://www.commerce.gov/data-and-reports/reports/2010/04/us-carbon-dioxide-emissions-and-intensities-over-time-detailed-accounting
U.S. Energy Information Administration (EIA) (2023). Energy-Related CO 2 Emission Data Tables. https://www.eia.gov/environment/emissions/state
U.S. Energy Information Administration (EIA) (2021). In 2020, the United States Produced the Least CO2 Emissions from Energy in Nearly 40 Years. https://www.eia.gov/todayinenergy/detail.php?id=48856
U.S. Energy Information Administration (EIA) (2022). EIA Expects U.S. Energy-Related Carbon Dioxide Emissions to Increase in 2022 and 2023 . https://www.eia.gov/todayinenergy/detail.php?id=50958#
World Bank (2017). U.S. Carbon (CO 2 ) Emissions 1990-2022. https://www.macrotrends.net/countries/USA/united-states/carbon-co2-emissions
Zhu, Q., Leibowicz, B. D., Busby, J. W., Shidore, S., Adelman, D. E., & Olmstead, S. M. (2022). Enhancing Policy Realism in Energy System Optimization Models: Politically Feasible Decarbonization Pathways for the United States. Energy Policy, 161, Article ID: 112754. https://doi.org/10.1016/j.enpol.2021.112754