Ключевые слова: alternative, balanced, black, circular, city, clean, contour, development, device, earth, eco, ecologically, ecology, economics, economy, electrical, energy, environmental, factory, flower, friendly, globe, green, growth, icon, illustration, industry, item, line, money, outline, planet, production, protection, recycling, responsibility, saving, sign, social, sustainable, symbol, system, technology, transport, waste, zero,