The latter might occur with a tree planting programme designed to improve local air quality, reduce the urban heat island, sequester C02 emissions, and improve the overall attractiveness of the city. Because most cities will procure the trees from nurseries or tree farms outside of their area and utilise existing staff to plant and maintain the trees, the economic impacts may be relatively small. This expanded economic activity primarily occurs in the green technology and service sector, however, which increases in size from C to D. The balance of the region’s traditional economy (B) does not increase in any meaningful way; although there might be some cost savings and other less tangible co-benefits (improved quality of life, etc.) In other words, the greening benefits do result in decreased resource use and/or decreased environmental degradation, but the benefits do not have significant spill-over in terms of the traditional economy.