You know how some metals such as iron feel cold to the touch because they take away body heat? People who have cast iron tubs complain that they are colder than the plastic ones. So in turn they use more heat to heat up the tub and that uses more energy. So what if we insulated the tubs just like we insulate our house to make a more stylish yet more efficient way of bathing? Turns out that the insulation helps the tub keep in more heat. Every time you incease the tempature one degree then it releses 2 extra co2 into the atmosphere. So can a bathtub really save the air from pollution. Yes!