“…In particular, we report the results of previous empirical analyses on the EKC, to affirm that CO2 usually shows an inverse-U shaped curve, and that its turning point is included within a range of per capita income values from 10.000$ to 35.400$ (Cole et al, 1997, Holtz-Eakin and Selden, 1995, Roberts and Grimes, 1997, Schmalensee et al, 1998, Unruh and Moomaw, 1998. With regard to air particles emissions, a variety of dynamics were found (quadratic, linear downward and U-inverted quadratic), with a peak around a per capita income between 7.300$ and 9.800$ (Carson et al, 1997, Cole et al, 1997, Panayotou, 1993, Selden and Song, 1994, Shafik and Bandyopadhyay, 1997, Schmalensee et al, 1998. Finally, waste still shows a mixed behaviour over time and with income growth (inverse-U shaped, linear increasing, quadratic), and it was not possible to determine the per capita income level at which the maximum of the EKC curve occurred (Cole et al, 1997, Shafik and Bandyopadhyay, 1997, Shafik, 1994.…”