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The last century is characterized by rapid development of cities, agglomerations and urban areas. Urban space needs to serve a variety of human needs: housing, working, social interaction, leisure, and mobility of persons and goods. Human beings also need nature within their living areas; green spots for recreation and relaxation. Trees, parks and other greenery helps provide healthy living conditions by cleaning the air of pollutants, absorbing noise, and regulating humidity. Beyond this direct anthropocentric (h...