G7 countries and China are considered not only the biggest energy producers globally but also the largest CO2 emission groups of countries among the world. In this study, we apply the Fourier quantile unit root test to ...

This study revisits whether CO2 emissions converge in G18 countries over the period of 1950–2013. To work on this empirical analysis, we employ a more powerful quantile unit root test with per capita CO2 emissions. While ...