Ключевые слова: abstract, alternative, background, bin, black, can, clean, color, colorful, concept, container, creative, design, drop, earth, eco, ecological, ecology, electric, electricity, energy, environment, environmental, gradient, graphic, icon, idea, illustration, innovation, inspiration, isolated, lamp, light, lightbulb, lightning, natural, nature, pollution, power, recycle, recycling, rubbish, set, sign, solution, symbol, trash, waste,