Ключевые слова: alternative, battery, bicycle, bio, bulb, car, clean, climate, collection, design, earth, eco, ecological, ecology, electric, electricity, element, energy, environment, environmental, fuel, globe, green, house, icon, industry, leaf, life, natural, nature, organic, planet, plant, pollution, recycle, recycling, renewable, resources, save, set, sign, solar, sun, symbol, tree, waste, water, web,