Ключевые слова: abstract, blurred, business, circle, concept, design, drop, earth, eco, ecology, electricity, emission, energy, environment, factory, fuel, green, hydropower, icon, illustration, industry, line, linear, modern, nature, nuclear, object, oil, outline, planet, plant, pollution, power, recycling, renewable, save, set, sign, solar, symbol, technology, thin, transport, tree, water, web, wind, zero,