Air

Because of the global existence warming then the temperature became hot, so as we must look for the artificial wind to stifle the blowing hot climate. Beforehand was with the fan from paper that was used manual enough by using the hands. Together with the development of the time was created the electric ventilator that used the electricity power. Afterwards was again created the new discovery of Air Conditioner that was sophisticated and digital where could tune the temperature and time that were wanted. But equipment AC this was expensive and wasteful electricity as well as freon increasingly increased the global cause warming in the earth.