Before revision:  The results provided by these fourteen countries significantly increase the priority of confronting global actions such as climate change mitigation  .
After revision:  The results provided by these fourteen countries significantly increase the priority of confronting global actions such as climate change mitigation . We finally extend the analysis by first allowing for fluctuations of the mean level in the Ornstein-Uhlenbeck model and secondly by considering modified versions of the Feller and lognormal models. In both cases, results remain basically unchanged thus demonstrating the robustness of the results presented .