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This study explores the relationship between economic growth and carbon dioxide and the moderating effect of institutional quality in Nigeria from 1990 to 2020, by employing long-run and short-run dynamic ARDL regression, quartile regression and Granger causality test for the estimation. Utilizing CO 2 per capita emissions; GDP per capita, a proxy for economic growth; capital stock (CAPSTK), proxy for capital investment in Nigeria and control of corruption and regulatory quality (COC and RGQ) which represent the effective environmental regulations and laws put in place for the control and prevention of environmental degradation, the study found a significant cointegration between CO 2 emissions and economic growth (lnGDP) in Nigeria. Furthermore, an N-shaped nexus exists between CO 2 emissions and economic growth in the long-run and short-run instead of the inverted U-shape curve postulated by the EKC hypothesis. This was confirmed by both ARDL and quartile regression results. Similarly, InCAPSTK contributed significantly to the growth of CO 2 emissions in Nigeria both in the long run and short run; although, the short run did so at 10% significant level. Contrary to expectations, control of corruption (COC) contributes significantly to CO 2 emissions in the long run, but when it interacts with income (InGDP COC), it significantly contributes to the reduction of CO 2 emissions. More so, regulatory quality (RGQ) had no significant impact on CO 2 emissions in Nigeria either in the long run or short run, even when it interacts with InGDP. This finding is further supported by the quartile regression outcomes and Granger causality. The study therefore concludes that CO 2 emissions–economic growth nexus in Nigeria assumes an N-shape both in the long run and short run. Based on the results, the study recommends that Government should pursue industrialisation policy with sophisticated method of production that will bring about rapid economic progress and at the same time support environmental sustainability.

PurposeThis study presents an economic investigation of the entrepreneurship practise of the Igbos of South-Eastern Nigeria. It is intended to deepen entrepreneurial development and employment generation in the country. This study also provides empirical support to situate the Igbo entrepreneurship model (IEM) among existing entrepreneurship literature, particularly for research in developing countries.Design/methodology/approachThe study adopts a quantitative approach to examine 1,187 responses carefully drawn from the Onitsha and Nnewi business clusters in Anambra state. In addition to descriptive demonstrations, the Propensity Score Matching (PSM) technique is employed to estimate the effects of treatment on the treated by pairing treatment and control units with similar attributes on the propensity score and other likely covariates. Specifically, the PSM is used to perform a counterfactual analysis of the effect of the entrepreneurship model on business outcomes by examining participants and non-participants in the IEM.FindingsThe key findings of the study indicate that entrepreneurs who participated in the IEM have higher business survival rate, business growth rate and access to trade and informal credit, while non-IEM entrepreneurs have better access to formal credit source than the IEM graduates.Research limitations/implicationsGeneralisation of results can be limited since the study is based on responses of samples drawn from two clusters (Onitsha and Nnewi) in Anambra State, South-East Nigeria. The clusters, though situated in Igbo land, are not the only Igbo business locations in the South-East region and the rest of the country. However, with the larger number of the respondents and synchronisation with existing literature in this subject area guarantee the robustness and applicability of the study findings.Originality/valueThe novelty of this study rests on its pioneering attempt to empirically examine how the IEM can drive entrepreneurial development in Nigeria. The authors also distil lessons for evidenced-based replication of the model to provide a sustainable employment channel for the country. The study posits, among other things, that the IEM can be a veritable approach for enterprise development and youth employment in Nigeria.

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