Ключевые слова: background, barrel, battery, bio, biodiesel, biofuel, canister, carriage, chemical, co2, color, contour, eco, ecological, ecology, environmental, factory, flask, fuel, green, hybrid, icon, illustration, infographic, isolated, laboratory, line, linear, lined, natural, nature, oil, outline, plant, production, railway, resource, sign, symbol, technology, vehicle,