Abstract
A sustainable transition to green growth is crucial for climate change adaptation and mitigation. However, the lack of clear and consistent definitions and common measures for green growth implies a disagreement on its determinants which hampers the ability to proffer valuable guidance to policymakers. We contribute to the global debate on green economic development by constructing green growth measures from 1990 to 2021 across 203 countries. The pillars of green growth are anchored on five dimensions namely natural resource base, socio-economic outcomes, environmental productivity, environmental-related policy responses, and quality of life. Contrary to the aggregated methods used in constructing indices in the extant literature, we employ a novel summary index technique with generalized least squares attributed-standardized-weighted index that controls for highly correlated variables and missing values. The constructed indicators can be used for both country-specific and global data modeling on green economic development useful for policy formulation.
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Background & Summary
Policies to promote green growth should be anchored on thorough knowledge and understanding of the concept. Likewise, tools to monitor green growth must have a reliable and comprehensive framework upon which progress can be recorded and compared across multiple entities. Yet, no two studies have a common measure or definition of green growth despite its widespread application in the scholarly and public policy discourse1. Not only does the lack of a common green growth measure stifle policymaking but also, hinders investments in its success2. The discourse on green growth is fairly new within international institutional development programs. As a multilateral agenda, green growth was first adopted in 2005 by 52 Asia-Pacific countries at Seoul’s 5th Ministerial Conference on Environment and Development (MCED). The UN Economic and Social Commission for Asia and the Pacific (UNESCAP) then described the concept as a focus on sustained economic progress driven by environmental sustainability while improving low-carbon society and socially inclusive development (UNDESA, 2012, p. 35). The OECD in 2009 defined the term as achieving sustained economic development while reducing the negative environmental externalities including climate change, loss of biodiversity, and natural resource exploitation3. The organization also became the first to provide a cross-country ranking and comparative framework of green growth indicators for its industrialized economies in 20114. The UN Environment Program (UNEP), under Towards Green Growth: Monitoring Progress program, also presented its first set of indicators in 2011. Per its definition, green economic growth improves well-being and social justice while reducing environmental risks and ecological footprint5. This infers that achieving green economic growth should prioritize green innovation, decarbonization, green trade, resource efficiency, and social inclusion6. Other international bodies such as the Global Green Growth Institute (GGGI), European Commission, and World Bank have all since proffered their definitions of the concept. In the wake of the discrepancies and unwieldy growth of the discourse surrounding green growth, the World Bank, UNIDO, OECD, and UNEP created the Green Growth Knowledge Platform (GGKP) in 2012. The GGKP is entrusted with the responsibility of collaboratively generating, managing, and sharing knowledge and data on green growth7. The GGGI produced the green growth index in 2019 aimed at preparing a measure that will enhance efforts to track the implementation of the Aichi Biodiversity Targets, Paris Accord, and SDGs8. At a country level, South Korea is widely recognized as the first to incorporate a comprehensive national strategy of green growth into its development plan in 20089. Today, myriad countries across the globe have adopted various strategies to achieve green growth, even outside the frameworks of the SDGs and the Paris Climate Accord. Noticeably, developing countries such as Rwanda, Ethiopia, Vietnam, and Morocco have recently been commended for their track records on the incorporation of green growth into national development programs10.
In light of the growing adoption of green growth development into national development plans, researchers have recently focused on assessing performances and prospects of a green future across countries, but mostly relying on varied measures of the concept. For example, Houssini and Geng10 assessed Morocco’s green growth performance between 2000 and 2018 using a self-derived green growth measure developed with a data envelopment (D.E) analysis technique. The assessment proceeded to score Morocco positively on several variables, commending the government on its conscious effort to promote green growth. Wang and Shao11 developed the “Hybrid Global ML Index” to assess the effect of formal and informal national green growth performance among G20 economies. The study found that most countries in the G20 have achieved green growth benchmarks in the entire sample period, except from 2008 to 200911. Several other studies used D.E analysis techniques but derived different green growth measures even when applied to the same units of analysis12,13,14,15,16. In related studies, Acosta, et al.8 assessed and ranked 115 countries in 2019 after using composite (C.O) analysis to develop a green growth index that strayed significantly from what its member partners such as the OECD and the UNEP historically relied upon. Their measure particularly paid attention to the inclusivity of green growth by being one of the first and only known two [with Kararach et al.17] to incorporate a gender dimension into the impacts of green growth policies. Though, using C.O analysis, other researchers2, however, arrived at measures that capture different sets of indicators for the same or different countries in their analyses.
Patently, the lack of clear and consistent definitions and common measures for green growth imperils attempts to compare findings across multiple studies1, discourages investments in its success2, and forces the “comparison of apples to oranges” when analyzing the extant literature1. Likewise, the lack of a common understanding of the meaning of green growth and the utilization of myriad varying sets of indicators implies a lack of agreement on its determinants2, which hampers the ability to proffer valuable guidance to policymakers. In this study, we propose a new set of green growth indicators that is founded on a thorough assessment of a wider range of factors contributing to green growth. Theoretically, we portend that the dynamic shift from brown to green growth entails strategic multifaceted actions that are informed by economic endowments, political choices, socio-economic capabilities, and environmental outcomes. Accordingly, we define green growth as a sustained economic development approach decoupled from negative environmental consequences but thrives on eco-technological efficiency, reduces poverty, and increases social inclusion. Empirically, we construct green growth measures whose pillars are anchored on the five dimensions of (i) natural asset base, (ii) policy responses, (iii) socio-economic outcomes, (iv) quality of life, and (v) environmental productivity (see Fig. 1). Contrary to the aggregated methods used in constructing indices, we employ a novel summary index technique with generalized least squares attributed-standardized-weighted index that control for highly correlated variables and missing values.
Methods
We analyze the frameworks and several indicators adopted by existing studies measuring green growth. For brevity, we analyze the indicators in light of our theoretical and empirical framework. Our empirical framework covers the dimensions of (i) natural asset base, (ii) policy responses, (iii) socio-economic outcomes, (iv) quality of life, and (v) environmental productivity (Fig. 1). To the best of our knowledge, these dimensions subsume the differing frameworks in the extant literature and, thus, allow us to review and analyze the individual indicators espoused in most studies. While not all studies in the extant literature are analyzed, Tables 1, 2 describe all known studies, their measurement frameworks, and other applications.
Natural asset base
Natural resources are central to the purpose of all green growth or sustainable development initiatives under the Aichi Biodiversity Targets, Paris Climate Accord, and SDGs8. The Green Growth Performance Measurement (GGPM) Program, for instance, developed in 2019 utilizes data from 115 countries and relies on 36 sampled indicators categorized under four dimensions. The dimensions include sustainable and efficient resource utilization, economic opportunities, natural capital protection, and social inclusion. Within the dimension of natural capital protection, for example, the authors discussed 12 indicators that reflect components such as the proportion of forests, biodiversity cover, and marine protected areas. However, the authors also incorporated measures such as the share of non-carbon agricultural emissions, mean annual air pollution, and the level of recreation and tourism in marine areas. By this calibration, the authors developed factors such as ecosystem, environmental quality, GHG reductions, and the cultural value of resources useful in measuring green growth under natural capital protection.
To design a novel tool to measure the complete impacts of green growth policies, Kim et al.4 synthesized a pool of 78 indicators in the extant literature down to what they describe as the 30 core and the 12 international indicators pertinent to assessing and comparing green growth across countries. Among the final 12 international indicators, two were used to measure the natural capital assets and environmental quality dimension which are: the inverse of domestic material consumption and the share of forest coverage per total land size. The authors’ omission of other non-forest resources in measuring natural capital is puzzling—as they offer no theoretical justification for the decision. However, the authors admit that by placing more weight on forest resources, the measure unfairly punishes countries with low forest cover such as Iceland. Baniya, et al.18 utilized six indicators to analyze green growth in Bangladesh and Nepal from 1985 to 2016—and to project its 2030 prospects in both countries. Natural capital was measured using the share of land with forest coverage. The authors argued that the six indicators chosen for analyses are the most frequently used in the extant literature from the OECD (2017) framework. However, similar to Kim et al.4, the omission of indicators capturing non-forest resources poses a challenge to the generalizability of the final measure of green growth.
Kararach, et al.17 developed the African Green Growth Index using data from 22 African countries. They featured 48 indicators representing five different dimensions including, socioeconomic context, productivity of resources and environment, natural asset base monitoring, gender, and governance. While natural assets include the usual measures of forests, land, agriculture, water, and aquatic resources, they also incorporated a disaster risk component. This measure tracks all disaster events from 1900 to 2014 and the population affected by disasters. Nonetheless, attempts to derive variables as far back as 1900 meant that the authors had to statistically impute a significant portion of the missing data, which admittedly leads to model uncertainties and affects the accuracy17. Inspired by the need to design a green growth index that accounts for the connection among society, economy, and nature, Li, et al.19 employed factor analysis to design an inclusive green growth indicator covering four unique dimensions, viz. social inclusion, economic security, resource use, and sustainability. However, the design failed to provide a stand-alone measure for natural capital. Instead, the authors created a resource use dimension that is measured by a derivation of energy consumption and variables of natural capital including arable land holdings, forest cover, land yield efficiency, and freshwater resources.
Environmental productivity
The productivity dimension of green growth entails the efficient ways by which economic growth is decoupled from resource use. An existing study focused on both ecosystem services and the productive use of resources such as energy, water, and land8. The authors reinforced this dimension with eight indicators ranging from measures such as the share of primary energy provision to GDP to total material footprint per capita. Kim, et al.4 dedicated two of the five dimensions of their framework to measuring productivity. The first dimension labeled as environmental efficiency of production is proxied by two indicators namely GHG emissions per GDP as well as the share of GDP from services. The second dimension labeled as environmental efficiency of consumption is proxied by three indicators including energy utilization per GDP, the share of renewable energy consumed, and withdrawal of both surface and groundwater out of total available water. The authors argued that their framework aligns with that of the OECD and purposely adopts the growth-accounting approach to reach a broader context of global decision-making. However, this also implies that unique country characteristics of certain measures are glossed over for the sake of generalizability. Similarly, four of the six indicators that constitute Baniya, et al.’s18 framework have productivity connotations. These include the productivity of carbon, energy, materials, and the share of renewables. The authors, however, do not account for other crucial dimensions seen in other studies such as policy responses, quality of life, and social inclusion.
Socio-economic dimension
New and sustainable economic opportunities are crucial to the success of green growth strategies. Thus, some authors incorporated socio-economic variables of green growth into their frameworks. For instance, Acosta, et al.8 employed a dimension termed green economic opportunities—that capture the share of economic opportunities that arise as investments shift from traditional activities to green sectors. They integrated this dimension with four indicators that capture environmental technology (i.e., number of patent publications), green employment, environmental goods exports, and net savings minus resource and pollution damages. On the other hand, Kararach, et al.17 introduced an entire dimension for gender, into which seven different indicators are fed. They argued that green growth must be assessed by its impact on societal inequalities. However, it is unclear why such indicators (i.e., female HIV prevalence, female labor force, female literacy, parliamentary seats, and ministerial positions held by women) were used to measure the gender dimension. Li, et al.19 argued that a green growth measure must quantitatively incorporate the themes of social equity, stability, and happiness. The authors provided an extensive set of indicators incorporated into the measure of social inclusion. However, unlike other studies that specifically addressed opportunities for women and minorities, Li, et al.19 does not specify what constitutes fair opportunities and what specific group of people development must consciously cater for.
Quality of life
The quality-of-life dimension of green growth tracks individuals’ social well-being attributed to resources extracted for economic growth. The existing studies that incorporated aspects of quality of life conceptualize the measures with different but similar and overlapping terminologies. For example, Acosta, et al.8 combined variables that track economic and social well-being into a single dimension described as social inclusion. They argued that inequality and poverty are directly affected by the availability of resources and crucial basic services. Conversely, people rely heavily on the environment such as forests, wildlife resources, and among other natural assets for livelihoods. They postulated that the social performance of green growth should be measured because sustained economic growth requires reduced inequality8. Consequently, they classified concepts such as “access to basic services and resources, gender balance, social equity, and social protection” under the social inclusion dimension. The authors supported this dimension with 12 indicators ranging from “access to safe drinking water and sanitation” to “proportion of urban population living in slums”. While theoretically cogent, this dimension does not distinguish traditional economic conditions such as income levels from social conditions or quality of life such as health. Kim et al.4 measured the quality-of-life dimension with only one indicator, viz. the public transportation modal split. They justified the selection of this measure among other dimensions on a criterium of policy relevance, analytical soundness, and measurability.
Policy responses
The policy response dimension of green growth is represented in fewer studies. Although the OECD framework incorporates a policy response dimension, the Green Growth Index developed by Acosta, et al.8 omits it. Among studies that justify the policy response dimension, Kim et al.4 measured the response with four indicators: environmental expenditure, environmental patents, green ODA per GDP, and green R&D per government budget. While Kararach, et al.17 does not incorporate a precise dimension for policy responses, they accentuated the distinct role of governance in their equation. Their “governance” dimension spells out four political indicators pertinent to measuring green growth. These indicators include “violence and/or terrorism, control of corruption, government effectiveness, political stability, rule of law, and regulatory quality”. Nonetheless, these variables primarily capture institutional quality and could have been complemented by other deliberate governmental efforts to promote green growth, such as eco-innovation R&D and environmental taxes.
Analysis of the literature
No two studies in the extant literature have the same or directly comparable measures of green growth1. From our review, no two studies have a common understanding of what set of indicators constitutes green growth or dimensions of green growth. In other scenarios, indicators used as proxies for one dimension in a study—for example, resource productivity—might be adopted as proxies for an entirely different dimension (such as economic opportunities) in another study. Consequently, their differential weightings in different dimensions imply they feature at different levels of importance in different studies. In such scenarios, comparing findings in the literature using these different measures might be tantamount to comparing apples to oranges1.
A few existing studies introduced distinct dimensions in their frameworks for various reasons. For instance, Li, et al.19 utilized GDP as a measure of economic growth and termed as “economic prosperity”. They proceeded to introduce an economic prosperity dimension using indicators such as trade volumes, R&D expenditure, urbanization, and inflation in addition to GDP and GDP per capita. They argued that economic prosperity should be the primary criterion of green and inclusive growth, stating further that more focus must be placed on the growth, development, and stability potentials of the economy. Notably, these indicators were captured in different studies, even under different dimensions and for different conceptual purposes. Contrary to studies that employed C.O. analysis to measure green growth, a large share of the extant literature relies on D.E. analysis to derive the green growth index. Studies that used C.O. analysis adopted a range of diverse inputs. For instance, whereas Song, et al.14 used labor and capital as inputs in their model, Cao, et al.13 relied on capital, labor, technological innovation, and energy consumption. Tables 1, 2 provide more information on the variability of datasets (used as inputs) and techniques in the existing studies.
Beyond studies utilizing C.O analysis and D.E techniques to measure green growth, a few other studies insist on simplifying the discourse further by adopting a single indicator out of the larger literature as a proxy for green growth. Accordingly, some researchers measure green growth using single indicators such as environmental and resource productivity20, carbon productivity21, and environmentally-adjusted-multifactor productivity22. In earnest, while these measures simplify analyses of green growth, they risk revealing only a portion of the picture. For instance, the use of carbon emissions as a sole indicator for green growth does not reveal any information beyond the pollution levels of the set of tools applied to achieving a certain level of growth23. Consequently, the contributions of other factors such as economic opportunities, policy responses, and resource protection to green growth are untenably omitted.
Index-making model
The schematic representation depicted in Fig. 2 shows the green growth index-making methodological structure used in this study. The steps include variable selection—used for categorization and classifying dimensions, income group & regional classifications, treatment of missing data, winsorization & normalization of data, adjusting the sign of variables where applicable, construction of weights, and construction of summary indices. While missing observations are often problematic in panel data, the estimation technique ignores missing outcomes (but also receives low weight) in creating new indices but utilizes all available data. Following the normalization procedure in developing the summary indicator, the technique further controls for missing data by fixing the values of the missing indicator to zero (0) — the mean of the reference group. This strategy further improves estimation efficiency by assigning lower weights to categories and dimensions with missing values24. The winsorizing technique entails generating new data by trimming 1st and 99th percentiles across countries and territories to treat extreme outliers25. Normalization \(\left[{\rm{norm}}=\left({y}_{i}-{y}_{min}\right)/\left({y}_{max}-{y}_{min}\right)\right]\) involves the generation of new data by normalization of scores ranging between 0 and 1 using the minimum (ymin) and maximum (ymax) observations while accounting for periodic data frequency across countries and territories. The summary index approach used to construct the green growth indicators can be expressed as24:
Where \({\bar{s}}_{i,j}\) is the constructed index (i.e., the outcomes can be categories, dimensions, and green growth indicators) with a weighted average Wi,j. wj,k denotes the weight of the normalized output \([({y}_{i,j,k}-{\bar{y}}_{j,k})/{{\sigma }}_{j,k}^{y}]\) from inverse covariance matrix \({\widehat{\Sigma }}_{j}^{-1}\), \({\widetilde{y}}_{i,j,k}\) is the inputs for individual i, indicators k, and country j. The normalized output is generated via effect sizes by dividing demeaned indicators \(({y}_{i,j,k}-{\bar{y}}_{j,k})\) by the standard deviation \({\sigma }_{j,k}^{y}\) of the reference group, whereas \({{\mathbb{K}}}_{i,j}\) represents non-missing outcomes for indicators k and country j. The summary index combines several variables into categories and several categories into dimensions and subsequently develops the green growth indicators. This test involves: (1) adjusting the sign of variables to indicate a better result, thus, a positive direction of the series always has positive consequences on the environment. (2) normalizing indicators into similar scales (3) constructing weights (4) constructing indices using weighted average and (5) normalizing indices. Thus, the winsorized and normalized dataset was classified into categories, dimensions, and green growth indicators. Contrary to the aggregated methods used in constructing indices26, the novel summary index technique with generalized least squares (GLS) attributed-standardized-weighted index used in this study controls for highly correlated variables and missing values.
Category indices of green growth
Our empirical assessment began with a panel-based descriptive statistical analysis of 152 raw data series spanning over 30 years. The descriptive statistical metrics led to the identification of several missing and extreme distributions requiring winsorizing. The winsorized and normalized dataset was classified into 18 category indices with a composition of the estimated weight of 152 variables. As the rule of the GLS summary index algorithm presented in Schwab, et al.27, highly-correlated variables were apportioned offsetting or small constructed weights whereas less-correlated or unique variables were apportioned higher constructed weights (Tables 3, 4). Positive weights signify a higher contribution to the summary index whereas negative weights signify factors that decrease the summary index. For example, demand-based CO2 emissions (CO2_DBEM) contribute the highest weight (1.447) to the summary emission index whereas production-based CO2 emissions (CO2_PBEM) show the highest weight (−0.865) that negatively enter the summary emission productivity index (Table 3). Energy consumption in other sectors (NRGC_OTH) and biomass (DMC_BIO) contribute the highest weights (0.350 and 0.278, respectively) to the energy productivity and non-energy material productivity indices whereas environmentally-adjusted multifactor productivity growth (EAMFP_EAMFPG) and relative advantage in environment-related technology (GPAT_DE_RTA) have the lowest weights (0.280 and 0.124, respectively) in the multifactor productivity and patents summary indices. Similarly, marine protected areas (PA_MARINE), allocable ODA to the environment sector (ODA_ENVSEC), and Petrol tax (FTAX_DIE_S) are assigned larger weights (0.520, 0.312, and 0.548, respectively) for environmental regulations, taxes & transfer, and official development assistance summary indices while purchasing power parity (PPP), environmentally-related R&D expenditure (ENVRD_GDP), and welfare costs of premature mortalities from exposure to PM2.5 (PM_SC) are assigned offsetting or small weights (−0.011, 0.079, and −1.859, respectively) for the economic dimension, environmental risks, and R&D summary indices. Besides, the population connected to public sewerage (ASEW_POP), permanent surface water (SW_PERMWAT), threatened vascular plant species (WLIFE_PL), and net migration (POP_NETMIGR) show the lowest weights (−0.144, −0.044, −0.025, and 0.070, respectively) assigned for the summary indices of access to drinking water & sanitation, water resources, wildlife resources, and social dimension (Table 4).
Constructing green growth Indicators
We constructed 10 green growth indicators (Models 1–10) using all five dimensions in Fig. 1 but with varying input characteristics for users to choose from. In Model 2, the characteristics of all five dimensions (i.e., environmental productivity, environmental quality, natural asset base, policy response, and socioeconomics) show better environmental performance. In Model 1, the characteristics of policy response, and socioeconomics dimensions show better environmental impacts but environmental productivity, environmental quality, and natural asset base worsen the environment. In Model 3, the characteristics of environmental quality, natural asset base, policy response, and socioeconomics improve the environment but environmental productivity declines environmental sustainability. In Model 4, the characteristics of environmental productivity, natural asset base, policy response, and socioeconomics improve the environment but the environmental quality dimension spurs environmental degradation. In Model 5, the characteristics of environmental productivity, environmental quality, policy response, and socioeconomics promote sustainable environment whereas natural asset base is detrimental to the environment. In Model 6, the characteristics of natural asset base, policy response, and socioeconomics reduces environmental degradation whereas environmental productivity and environmental quality increase pollution. In Model 7, environmental quality, policy response, and socioeconomics improve sustainability while environmental productivity and natural asset base hamper clean environment. In Model 8, environmental productivity, policy response, and socioeconomics decline environmental threats whereas environmental quality and natural asset base escalate environmental consequences. In Model 9, the characteristics of environmental productivity, environmental quality, natural asset base, policy response, and socioeconomics deteriorate the environment and thwart sustainable transition. Model 10 incorporates all conditions in Models 1–9 except that the average weights of all indicators was used for its construction.
The negative characteristics of dimensions in Models 1–10 (used to construct the 10 green growth indicators) were determined using the flipping scenarios. The flipping scenarios used in calculating the ten green growth indicators are presented in Table 5. The parenthesis (…%) denotes the percentage weight of dimensions (in Fig. 3) from the model used to construct green growth indicators. Model 1 covers the role of policy response (23.29%), natural asset base (21.97%), socioeconomics (20.97%), environmental productivity (17.69%), and environmental quality (16.07%) while altering the sign (i.e., flipping implies altering the sign to move in the opposite direction) of environmental productivity, environmental quality, and natural asset base. Model 2 captures socioeconomics (28.95%), environmental quality (19.74%), natural asset base (18.87%), policy response (16.25%), and environmental productivity (16.18%) with no flipping option. Model 3 comprises socioeconomics (26.62%), environmental quality (24.83%), environmental productivity (18.73%), natural asset base (15.92%), and policy response (13.89%) while altering the sign of environmental productivity. Model 4 encompasses environmental quality (22.04%), environmental productivity (21.38%), socioeconomics (19.85%), natural asset base (19.78%), and policy response (16.94%) while altering the sign of environmental quality. Model 5 includes socioeconomics (25.71%), natural asset base (21.83%), policy response (19.09%), environmental productivity (18.81%), and environmental quality (14.56%) while altering the sign of natural asset base. Model 6 captures socioeconomics (24.39%), natural asset base (22.55%), policy response (19.54%), environmental quality (18.14%), and environmental productivity (15.39%) while altering the sign of environmental productivity, and environmental quality. Model 7 entails natural asset base (25.23%), socioeconomics (22.26%), environmental productivity (19.13%), environmental quality (17.83%), and policy response (15.56%) while altering the sign of environmental productivity, and natural asset base. Model 8 covers natural asset base (22.24%), policy response (21.27%), environmental productivity (21.12%), socioeconomics (18.19%), and environmental quality (17.18%) while altering the sign of environmental quality, and natural asset base. Model 9 includes environmental productivity (28.95%), policy response (19.74%), natural asset base (18.87%), environmental quality (16.25%), and socioeconomics (16.18%) while altering the sign of socioeconomics, policy response, natural asset base, environmental quality, and environmental productivity. Finally, the weight of dimensions used to construct green growth indicators reveals an average weight contribution (Model 10) of 22.57%, 20.81%, 19.71%, 18.52%, and 18.40% in the order of dimensions: socioeconomics > natural asset base > environmental productivity > environmental quality > policy response (Fig. 3). Figure 4 presents the optimal green growth index across countries for the period 2021. Score 0 implies economies have low performance in transitioning toward green growth whereas Score 1 infers countries have high performance toward green growth. The comparisons between countries for other green growth indicators are presented in Supplementary Fig. 1.
Data Records
We employed 152 variables (“OriginalData.xlsx”28) for 203 economies (see sampled countries with ISO3 code in Supplementary Table 1) based on the theoretical and empirical framework presented in Tables 1, 2 and Fig. 1 while integrating the sustainable development goals. We collected our global dataset spanning the period from 1990 to 2021 from OECD29 with an initial 16,184 observations. The data were sorted into 17 categories (see Fig. 2) namely emissions (12 variables), energy (12 variables), non-energy (10 variables), multifactor productivity (3 variables), environmental risks (11 variables), access (5 variables), water (10 variables), land (17 variables), forest (5 variables), wildlife (4 variables), temperature (1 variable), patents (4 variables), research & development [R&D] (5 variables), official development assistance [ODA] (9 variables), taxes (27 variables), regulations (2 variables), economic (10 variables), and social (5 variables) [see details of the 152 variables in Supplementary Table 2]. The 17 categories are subsequently classified into 5 dimensions, viz. natural assets (5 categories—water, land, forest, wildlife, and temperature), policy responses (5 categories—patents, R&D, ODA, taxes, and regulations), socio-economic (2 categories—social, and economic), quality of life (2 categories—environmental risks, and access), and environmental productivity (4 categories—emissions, energy, non-energy, and multifactor productivity). Finally, we use permutation and combination strategies detailed in subsequent sub-sections to construct 10 global indicators of green growth labeled as Model 1 (GreenGrowth1), Model 2 (GreenGrowth2), …, and Model 10 (GreenGrowth10). Table 6 shows the data description of constructed categories, dimensions, and green growth indicators—which are publicly available in the Figshare repository28.
Technical Validation
To validate the quality of the dataset, we employed permutation and combination scenarios to construct 9 green growth indicators aside from the optimal indicator (labeled as Model 2). We further used statistical distribution30 to examine variations across income groups. The Games-Howell test shows that the pairwise distribution in Figs. 5–14 (excluding Figs. 5, 12) is not significantly different across groups, however, the mean of the optimal green growth (Fig. 6) indicator across income groups is in the descending order of high-income > upper-middle-income > lower-middle-income > low-income. This order is consistent with the environmental Kuznets curve (EKC) hypothesis31 which underscores improved environmental performance with rising income. Changes in the order across income groups in Figs. 5–14 (excluding Fig. 6) can be explained by the scenarios presented in Fig. 3. Yet, all constructed green growth indicators are heterogeneous across countries and territories (Fig. 15).
Usage Notes
We developed 10 green growth indicators to examine the progress toward achieving a sustainable transition from a brown economy to a green economy. Each of the green growth indicators has underlying conditions and assumptions presented in Table 5 and Fig. 3. However, Model 2 (GreenGrowth2) is the most optimal green growth indicator showing economies with high scores have better performance and sustainable transition to green economic development. Evidence from Fig. 15 shows that future research that employs our datasets for panel data modeling should control for heterogeneous effects across economies. The caveat: there may be an underestimation of the standard errors of constructed dimensions and indicators because the GLS-derived weights are inclusively estimated parameters.
Code availability
No custom code was used to generate or process the data described in the manuscript—however, we used the “swindex” package in Stata [Stata/SE 17.0 for Mac (Intel 64-bit)] software to execute the steps detailed in the Methods section.
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S.A.S. and P.O.A. designed the dataset; S.A.S. collated the data, S.A.S., P.O.A. and J.T. wrote the manuscript, and S.A.S. supervised the research.
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Sarkodie, S.A., Owusu, P.A. & Taden, J. Comprehensive green growth indicators across countries and territories. Sci Data 10, 413 (2023). https://doi.org/10.1038/s41597-023-02319-4
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DOI: https://doi.org/10.1038/s41597-023-02319-4
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