Ключевые слова: alternative, background, battery, bio, blade, clean, concept, design, eco, ecology, electric, electricity, element, energy, environment, equipment, generator, graphic, green, icon, illustration, image, industry, isolated, label, logo, natural, nature, ocean, power, protection, recycle, renewable, save, sea, sign, source, symbol, technology, turbine, water, wave, wind, windmill,