Ключевые слова: alternative, bird, blank, building, business, care, city, concept, conservation, copy space, creative, development, eco, ecology, electric, electricity, empty, energy, environment, finger, grass, green, hand, handful, holding, human, idea, industry, innovation, leaf, man, natural, nature, power, protect, renewable, river, save, saving, sign, sky, skyline, skyscraper, solution, symbol, technology, tower, tree, turbine, urban, wind, windmill,