Ключевые слова: banner, blank, cartoon, clean, clipart, color, convert, drawing, eco, ecology, electrical, electricity, element, energy, engineering, environment, frame, friendly, generate, graphic, green, icon, illustration, logo, manufactured, natural, nature, plant, plants, power, produce, producing, science, sign, signage, signs, symbol, technology, template, tidy, transform, transformation, turbine, wind, wind turbine, windmill,