Ключевые слова: abstract, architecture, blue, building, building exterior, business, city, cityscape, concept, cycling, design, eco, ecology, electricity, energy, environment, environmental conservation, graphic, green, green color, house, illustration, landscape, life, modern, nature, park, plant, power, public park, recycle, sky, skyscraper, social issues, street, sustainable resources, symbol, technology, town, tree, urban, wind power, wind turbine,