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b): IPS Panel Unit Root Test Statistics 

b): IPS Panel Unit Root Test Statistics 

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A government’s two leading macroeconomic objectives are to sustain productivity growth and to ensure the prevalence of essential environmental conditions for the welfare of its civilian. Over the past decades, many countries have experienced high levels of productivity. However, despite widespread concern about greenhouse effect and climate change,...

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... Jaunky (2009) previously surveyed the link between CO2 emissions and productivity growth for 27 rich countries over the period 1974-2000. Unidirectional causality running from productivity growth to CO2 emissions is found in the short run, whereas bidirectional causality is revealed in the long run. ...
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In this paper, we analyze the existence of the environmental Kuznets curve as reported by Kuznets (Am Econ Rev 5:1–28, 1955) by using the methodology proposed by Kejriwal and Perron (J Econ 146:59–73, 2008, J Bus Econ Stat 28:503–522, 2010) and applying Jaunky’s (Energy Policy 39(3):1228–1240, 2011) specification using quarterly data from 1973:1 to 2015:2. We also allow different behaviors across time and identify it by economic sectors. Our results show the existence of the environmental Kuznets curve (EKC) in the USA only when we allow for structural breaks. Interestingly, the industrial sector shows a different pattern than do other economic sectors; with the beginning of the economic crisis, it appears to have abandoned the objective of the environmental stabilization found until then.
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The paper attempts to test the Environment Kuznets Curve (EKC) hypothesis for 36 high-income countries for the period 1980-2005. The test is based on the suggestion of Narayan and Narayan (2010). Various panel data unit root and co-integration tests are applied. Carbon dioxide (CO2) emissions and GDP series are integrated of order one and co-integrated, especially after controlling for cross-sectional dependence. Additionally, the Blundell-Bond system generalised methods of moments (GMM) is employed to conduct a panel causality test in a vector error-correction mechanism (VECM) setting. Unidirectional causality running from real per capita GDP to per capita CO2 emissions is uncovered in both the short-run and the long-run. The empirical analysis based on individual countries provides evidence of an EKC for Greece, Malta, Oman, Portugal and the United Kingdom. However, it can be observed that for the whole panel, a 1% increase in GDP generates an increase of 0.68% in CO2 emissions in the short-run and 0.22% in the long-run. The lower long-run income elasticity does not provide evidence of an EKC, but does indicate that, over time, CO2 emissions are stabilising in the rich countries.