Exploring role of energy-related research and development investments,income,and energy sub-types on environmental change in the USA by marginal effect analysis
Restricted accessResearch articleFirst published online 2026
Exploring role of energy-related research and development investments,income,and energy sub-types on environmental change in the USA by marginal effect analysis
In response to the climate change problem, ensuring a transformation to green economies is highly critical. Therefore, countries have been trying to make their economies decarbonized by taking various measures. Accordingly, this study examines the USA case by using carbon dioxide emissions (load capacity factor) as the main (robustness) environmental proxy, considers energy-related research and development (R&D) investment types as main explanatory variables, controls income and energy utilization sub-types, and performs a novel kernel-based least squares (KRLS) model on data from 1974 to 2022 to apply a marginal effect analysis. The results show that (i) R&D investment sub-types have an insignificant effect on carbon dioxide (CO2) emissions; (ii) income structure does not contribute in greening economy; (iii) among energy utilization sub-types, only renewable energy has a decreasing effect on CO2 emissions, whereas nuclear and fossil energy sub-types have a reverse ones; (iv) the effects of the factors on CO2 emissions differentiate across percentiles and estimation models; (v) the robustness of the empirical results are verified based on alternative indicator; (vi) the KRLS model has a high estimation capability around 99.7%. Hence, the empirical results reveal the critical role of renewable energy use, while the current R&D investment structure, energy utilization, and income are not supportive of a green economy in the USA because these do not provide a decrease in CO2 emissions.
TaşkınDKılıç DeprenSAyhanF. How are energy-related R&D investments effective on environment-related patents? Empirical evidence from the USA and Canada. J Sustain Dev Issues2024; 2: 115–128.
2.
WangQZhangFLiR. Artificial intelligence and sustainable development during urbanization: Perspectives on AI R&D innovation, AI infrastructure, and AI market advantage. Sustain Dev2025a; 33: 1136–1156.
3.
WangQSunTLiR. Does artificial intelligence (AI) enhance green economy efficiency? The role of green finance, trade openness, and R&D investment. Humanit Soc Sci Commun2025b; 12: 1–22.
SchumpeterJA. The theory of economic development: An inquiry into profits. Capital, credit, interest, and the business cycle, vol. 55. Cambridge, MA: Transaction publishers, 1934.
8.
SolowRM. Technical change and the aggregate production function. Rev Econ Stat1957; 39: 312–320.
9.
YoungA. Learning by doing and the dynamic effects of international trade. Q J Econ1991; 106: 369–405.
10.
GrossmanGMHelpmanE. Innovation and Growth in the Global Economy. Cambrigde, MA: MITT Press, 1991.
11.
AghionPHowittP. A model of growth through creative destruction. Econometrica1992; 60: 323e351.
12.
GrossmanGMKruegerAB. Environmental impacts of a North American free trade agreement. NBER Working Paper, No. 3914. 1991.
13.
StokeyNL. Are there limits to growth?Int Econ Rev (Philadelphia)1998; 39: 1–31.
14.
KoçakEUlucakZŞ. The effect of energy R&D expenditures on CO2 emission reduction: Estimation of the STIRPAT model for OECD countries. Environ Sci Pollut Res2019; 26: 14328–14338.
15.
KartalMT. Time, frequency, and quantile-based impact of energy-related R&D investments on sectoral environmental degradation in the United States. Energy Environ2024; 36: 3658–3676.
16.
ApergisNEleftheriouSPayneJE. The relationship between international financial reporting standards, carbon emissions, and R&D expenditures: Evidence from European manufacturing firms. Ecol Econ2013; 88: 57–66.
17.
ChoJHSohnSY. A novel decomposition analysis of green patent applications for the evaluation of R&D efforts to reduce CO2 emissions from fossil fuel energy consumption. J Cleaner Prod2018; 193: 290–299.
18.
WeinaDBotangHXinZ, et al.How does green technology influence CO2 emission in China?-an empirical research based on provincial data of China. J Environ Biol2015; 36: 745.
19.
KartalMTShahbazMTaşkınD, et al.How are energy transition and energy-related R&D investments effective in enabling decarbonization? Evidence from nordic countries by novel WLMC model. J Environ Manag2024a; 365: 121664.
20.
ThompsonS. Strategic analysis of the renewable electricity transition: Power to the world without carbon emissions?Energies2023; 16: 6183.
21.
GrossmanGMKruegerAB. Economic growth and the environment. Q J Econ1995; 110: 353–377.
22.
BoS. A literature survey on environmental kuznets curve. Energy Procedia2011; 5: 1322–1325.
23.
GillARViswanathanKKHassanS. The environmental kuznets curve (EKC) and the environmental problem of the day. Renew Sustain Energy Rev2018; 81: 1636–1642.
24.
HansenJSatoMRussellG, et al.Climate sensitivity, sea level and atmospheric carbon dioxide. Philos Trans R SocA Math Phys EngSci2013; 371: 20120294.
25.
SteffenWRichardsonKRockströmJ, et al.Planetary boundaries: Guiding human development on a changing planet. Science2015; 347: 1259855.
26.
BernsteinPMMontgomeryWDTuladharSD. Potential for reducing carbon emissions from non-annex B countries through changes in technology. Energy Econ2006; 28: 742–762.
27.
HammarHLöfgrenÅ. Explaining adoption of end of pipe solutions and clean technologies—determinants of firms’ investments for reducing emissions to air in four sectors in Sweden. Energy Policy2010; 38: 3644–3651.
28.
YerginD. The prize: The epic quest for oil, money, and power. New York: Simon & Schuster, 1991.
29.
DownsJAStocksLKBearerSL. Environmental impacts of coal mining. In: RoseJ (ed.) The environmental chemistry of coal. London, UK: CRC Press, 1999, pp.117–153.
30.
ZhangSLiuX. The roles of international tourism and renewable energy in environment: New evidence from Asian countries. Renew Energy2019; 139: 385–394.
31.
HanifIAzizBChaudhryIS. Carbon emissions across the spectrum of renewable and nonrenewable energy use in developing economies of Asia. Renew Energy2019; 143: 586–595.
32.
ChenYZhaoJLaiZ, et al.Exploring the effects of economic growth, and renewable and non-renewable energy consumption on China’s CO2 emissions: Evidence from a regional panel analysis. Renew Energy2019; 140: 341–353.
33.
RaghavendraCMaheshRKhanMK, et al.Impact of carbon emissions, renewable and non-renewable energy consumption on inbound cross-border mergers and acquisition’s investment inflow. Environ Dev Sustain2024; 27: 14123–14142.
34.
UllahSLinB. Clean energy initiatives in Pakistan: Driving sustainable development and lowering carbon emissions through environmental innovation and policy optimization. J Environ Manag2025a; 373: 123647.
JohanssonTBPatwardhanAPNakićenovićNetal (eds) Global energy assessment: Toward a sustainable future. Cambridge, UK: Cambridge University Press, 2012.
37.
MaheshAJasminKS. Role of renewable energy investment in India: An alternative to CO2 mitigation. Renew Sustain Energy Rev2013; 26: 414–424.
38.
ShenYSuZMalikMY, et al.Does green investment, financial development and natural resources rent limit carbon emissions? A provincial panel analysis of China. Sci Total Environ2020; 755: 142538.
39.
ZhangMYangZLiuL, et al.Impact of renewable energy investment on carbon emissions in China - an empirical study using a nonparametric additive regression model. Sci Total Environ2021; 785: 147109.
40.
SachsJDWooWTYoshinoN, et al.Importance of green finance for achieving sustainable development goals and energy security. In Springer eBooks (pp. 1–10). 2019.
41.
KuangHAkmalZLiF. Measuring the effects of green technology innovations and renewable energy investment for reducing carbon emissions in China. Renew Energy2022; 197: 1–10.
42.
YadavAGyamfiBAAsonguSA, et al.The role of green finance and governance effectiveness in the impact of renewable energy investment on CO2 emissions in BRICS economies. J Environ Manag2024; 358: 120906.
43.
LiJLiS. Energy investment, economic growth and carbon emissions in China-empirical analysis based on spatial durbin model. Energy Policy2020; 140: 111425.
44.
YangZZhangMLiuL, et al.Can renewable energy investment reduce carbon dioxide emissions? Evidence from scale and structure. Energy Econ2022; 112: 106181.
45.
SeldenTMSongD. Environmental quality and development: Is there a kuznets curve for air pollution emissions?J Environ Econ Manage1994; 27: 147–162.
46.
AjmiANHammoudehSNguyenDK, et al.On the relationships between CO2 emissions, energy consumption and income: The importance of time variation. Energy Econ2015; 49: 629–638.
47.
AwanAAbbasiKRRejS, et al.The impact of renewable energy, internet use and foreign direct investment on carbon dioxide emissions: A method of moments quantile analysis. Renew Energy2022; 189: 454–466.
48.
HarbaughWTLevinsonAWilsonDM. Reexamining the empirical evidence for an environmental kuznets curve. Rev Econ Stat2002; 84: 541–551.
49.
ShenJ. A simultaneous estimation of environmental kuznets curve: Evidence from China. Chin Econ Rev2006; 17: 383–394.
50.
HossainMS. Panel estimation for CO2 emissions, energy consumption, economic growth, trade openness and urbanization of newly industrialized countries. Energy Policy2011; 39: 6991–6999.
51.
UllahSLinB. Unveiling the green path: The role of green finance and just energy transition in environmental sustainability. Gondwana Res2025b; 148: 348–367.
52.
FodhaMZaghdoudO. Economic growth and pollutant emissions in Tunisia: An empirical analysis of the environmental kuznets curve. Energy Policy2010; 38: 1150–1156.
53.
FostenJMorleyBTaylorT. Dynamic misspecification in the environmental kuznets curve: Evidence from CO2 and SO2 emissions in the United Kingdom. Ecol Econ2012; 76: 25–33.
54.
KartalMTTaşkınDShahbazM, et al.Role of energy transition in easing energy security risk and decreasing CO2 emissions: Disaggregated level evidence from the USA by quantile-based models. J Environ Manag2024b; 359: 120971.
55.
WangQLiuTLiR. Leveraging economic efficiency for CO2 reduction and energy transition: The role of climate vulnerability, GVC integration, digitalization and energy intensity. Sustain Dev2025c; 33: 5038–5068.
56.
PataUKWangQKartalMT, et al.The role of disaggregated renewable energy consumption on income and load capacity factor: A novel inclusive sustainable growth approach. Geosci Front2024; 15: 101693.
BroockWAScheinkmanJADechertWD, et al.A test for independence based on the correlation dimension. Econom Rev1996; 15: 197–235.
59.
HainmuellerJHazlettC. Kernel regularized least squares: Reducing misspecification bias with a flexible and interpretable machine learning approach. Polit Anal2014; 22: 143–168.
60.
SinhaAGhoshVHussainN, et al.Green financing of renewable energy generation: Capturing the role of exogenous moderation for ensuring sustainable development. Energy Econ2023; 126: 107021.
61.
KartalMTSharifAMagazzinoC, et al.The Effects of Energy Transition and Environmental Policy Stringency Subtypes on Ecological Footprint: Evidence from BRICS Countries via a KRLS Approach. Engineering2025a. 10.1016/j.eng.2025.02.007
62.
LinBUllahS. Modeling the impacts of changes in nuclear energy, natural gas, and coal in the environment through the novel DARDL approach. Energy2024; 287: 129572.
63.
RazaMYTangS. Nuclear energy, economic growth and CO2 emissions in Pakistan: Evidence from extended STRIPAT model. Nucl Eng Technol2024; 56: 2480–2488.
64.
ZhangYLiLSadiqM, et al.The impact of non-renewable energy production and energy usage on carbon emissions: Evidence from China. Energy Environ2024; 35: 2248–2269.
65.
MentelGTarczyńskiWAzadiH, et al.R&D human capital, renewable energy and CO2 emissions: Evidence from 26 countries. Energies2022; 15: 9205.
66.
ShahzadiIYaseenMRKhanMTI, et al.The nexus between research and development, renewable energy and environmental quality: Evidence from developed and developing countries. Renew Energy2022; 190: 1089–1099.
67.
MamkhezriJKhezriM. Assessing the spillover effects of research and development and renewable energy on CO2 emissions: International evidence. Environ Dev Sustain2024; 26: 7657–7686.
68.
KartalMTMukhtarovSDeprenÖ, et al.How can SDG-13 be achieved by energy, environment, and economy-related policies? Evidence from five leading emerging countries. Sustain Dev2025b; 33: 5110–5133.
69.
KartalMTSantoshMTaşkınD, et al.Impact of productive capacity shifts, energy-related R&D investments, energy use, and income on environmental degradation: Evidence from leading developed countries. Renew Energy2025c; 251: 123338.
70.
KartalMTKimEMukhtarovS, et al.Effect of AI-related patents, energy transition, environmental policy stringency, income, and energy consumption sub-types on the environmental sustainability: Evidence from China by KRLS approach. J Environ Manag2025d; 395: 127924.
71.
KartalMTGafarliGTaşkınD, et al.Role of market and nonmarket-based environmental policies, energy use, and income on environmental sustainability: The case of G7 countries. Environ Sustain Indicators2025e; 28: 101006.
72.
SikderMWangCYaoX, et al.The integrated impact of GDP growth, industrialization, energy use, and urbanization on CO2 emissions in developing countries: Evidence from the panel ARDL approach. Sci Total Environ2022; 837: 155795.
73.
KinyarABothongoK. The impact of renewable energy, eco-innovation, and GDP growth on CO2 emissions: Pathways to the UK's net zero target. J Environ Manag2024; 368: 122226.
74.
GyamfiBAAdedoyinFFBeinMA, et al.The anthropogenic consequences of energy consumption in E7 economies: Juxtaposing roles of renewable, coal, nuclear, oil and gas energy: Evidence from panel quantile method. J Cleaner Prod2021; 295: 126373.
75.
BelucioMSantiagoRFuinhasJA, et al.The impact of natural gas, oil, and renewables consumption on carbon dioxide emissions: European evidence. Energies2022; 15: 5263.
76.
RehmanAMaHOzturkI, et al.Revealing the dynamic effects of fossil fuel energy, nuclear energy, renewable energy, and carbon emissions on Pakistan’s economic growth. Environ Sci Pollut Res2022; 29: 48784–48794.
77.
MurshedMSabooriBMadalenoM, et al.Exploring the nexuses between nuclear energy, renewable energy, and carbon dioxide emissions: The role of economic complexity in the G7 countries. Renew Energy2022; 190: 664–674.
78.
HuangAGuoMDaiL, et al.Budgeting for a greener future: Asymmetric nexus between nuclear energy technology budgets and CO2 emissions. Technol Forecast Soc Change2024; 202: 123321.
79.
HailemariamAIvanovskiKDzhumashevR. Does R&D investment in renewable energy technologies reduce greenhouse gas emissions?Appl Energy2022; 327: 120056.
80.
HerzerD. The impact on domestic CO2 emissions of domestic government-funded clean energy R&D and of spillovers from foreign government-funded clean energy R&D. Energy Policy2022; 168: 113126.
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