The reduction of greenhouse gas emission reduction also benefits from the development of the recycling industry. In Kitakyushu, the only green growth model city in Asia selected by OECD, recycling industries are strongly promoted and financially supported as part of the Eco-town program in Japan. Given the industrial sector in Kitakyushu accounts for more than 60% energy consumption of the city, the development of recycling industry results in substantial energy reduction due to the economies of scale effects; the concentration of CO is, thus, found to decline accordingly.