Ключевые слова: alternative, battery, bicycle, bio, biology, brown, bulb, button, car, clean, climate, contour, creative, drop, earth, eco, ecology, electric, energy, environment, environmentally, flat, friendly, fuel, global, globe, green, home, house, hybrid, icons, leaf, line, linear, minimal, nature, oil, power, recycle, set, sign, sun, symbol, thin, tree, turbine, vector, wind,