Ключевые слова: animal, barrel, bin, black, cloud, co2, contour, dead, dioxide, drop, energy, food, fuel, gold, golden, green, hand, icon, illustration, isolated, lamp, light, line, linear, measurement, nature, no, ocean, oil, outline, panel, planet, plastic, power, railroad, recycle, sea, set, sky, symbol, train, transportation, trash, tsunami, waste, water, weather, world,