In replacement of polluting technologies was created the green industry, a innovative solution that promote clean development and reduce the emission of greenhouse gases. Los Angeles is a example of city which encourages the production of electric cars. Today the city has 2,300 buses fueled by natural gas.

The green industry is economically feasible to create new jobs, research and development of new technologies. That is the reason because the city is being an attractive centre of private investment. In Copenhagen, the partnership between the municipal government and companies promote industrial centers with green knowledge to make the city a sustainable laboratory where companies can test their technologies.