Ключевые слова: black, building, coal, dam, eco, ecological, ecology, ecosystem, electric, electricity, energy, engineering, environment, environmental, factory, gas, hydro, hydroelectric, icon, icons, image, industrial, industry, logo, nature, nuclear, oil, petroleum, pictogram, plant, platform, png, power, production, pump, refinery, renewable, resource, sign, station, symbol, technology, transparent, turbine, water,