trees in such areas, therefore benefitting from small green urban spaces in several categories. Olive trees offer cultural and traditional sustainability, due to their importance in Greek culture and history. They offer local food production and a source of income. Furthermore, the trees increase shade in heat island, and decrease the risk of fire. They are a low-maintenance crop which emphasizes sustainable landscape design within multiple realms, making their implementation a favorable way to design challenging urban landscapes in a sustainable fashion. The emphasis on the cultural identity of the olive trees ensures cultural sustainability, the suggested fourth pillar in sustainable development. With urbanization and industrialization discouraging the participation in rural landscapes and communities, the United Nations has sought ways to restore culture sustainability with these spaces through touristic potential. In 1990, UNESCO emphasized the creation of GeoParks to instill geotourism and restore historical and cultural integrity to a site. By rooting these projects in cultural incentives, landscape designs can focus on rural community ideals, rather than metropolitan restrictions. Ţara Haţegului in Romania is an ideal example of such a project which achieves sustainable landscape architecture by using cultural emphasis. Combining landscape architecture with cultural identity ensures that the land becomes apart of a community's heritage. The Council of Europe has created a framework convention on the value of cultural heritage, and they have concluded that cultural integrity correlates with social responsibility of a landscape. They emphasize approaching landscape architecture in a conscious matter that protects people’s surrounding. By connecting people to their environment, it becomes part of their identity, and it gives motive to protect the ecosystem. The council concludes that such multidisciplinary policies are essential to cultivate sustainable landscape architecture. Certifications Green Business Certification Inc. has partnered with the U.S. Green Building Council to create the Sustainable SITES Initiative certification program. This program has adopted LEED strategies in promoting the sustainability of landscapes within the built environment. See also Built environment Carbon cycle re-balancing Climate-friendly gardening Context theory Cultural sustainability Energy-efficient landscaping Feng shui Frederick Law Olmsted Green roof Green transport GeoParks Ian McHarg Landscape planning Sustainable agriculture Sustainable gardening Sustainable landscaping Sustainable planting Sustainable urban drainage Urban agriculture Urban forestry Urbanization Taoism References Landscape and sustainability John F. Benson, Maggie H. Roe (2007) Sustainable Site Design: Criteria, Process, and Case Studies Claudia Dinep, Kristin Schwab (2009) Sustainable urban design: perspectives and examples Work Group for Sustainable Urban