Environmental protection is important for all nations. For preparing a policy to combat the climate change, we propose a new approach whose assessment is useful for promoting sustainable development and green growth economy. The approach also assesses a technological progress over time, focusing upon pollution reduction. We apply it to 37 OECD countries during 1995–2014, examine performance differences among country groups, and discuss these convergences over the period. Methodologically, we extend the previous study (Sueyoshi and Wang, 2020) that has compared between OECD and Non-OECD nations. It concluded that the former group outperformed the latter group in their environmental measures and club convergence. It is expected that the organization provides member nations with an opportunity to improve the status of green technology for economic growth. Focusing upon OECD nations, this study examines two unified performance measures. The results of this study cannot find their overall convergence. Rather, they are classified into one or two club(s). The results indicate that there are uneven economic and technological progresses between higher and lower groups. The disparity implies that OECD membership does not guarantee uniform green growth and sustainable development for countries. This study also finds that "renewable and nuclear" energy shares are important in maintaining the higher group within OECD because both are zero-carbon emission energy sources.