Ключевые слова: abstract, alternative, battery, bulb, car, design, drop, earth, eco, ecological, ecology, electric, element, energy, environment, environmental, factory, flower, fuel, garbage, global, globe, green, hand, house, icon, icons, illustration, leaf, light, line, natural, nature, outline, plant, pollution, power, recycle, recycling, renewable, set, sign, solar, sun, symbol, thin, tree, water, wind,