Ключевые слова: alternative, aqua, art, bin, brain, cable, can, color, colorful, concept, conservation, contour, drop, eco, ecology, electric, electricity, energy, environmental, faucet, gear, generator, green, head, human, icon, illustration, isolated, lamp, leaf, led, light, line, linear, outline, pop, popart, power, recycle, recycling, set, sign, symbol, trash, turbine, water, wheel,