In countries like the United States, Australia and West Germany, for example, a bery great part of the energy we use is consumed in family households and private cars. In less developed countries such as India, this is not so much the case. The more advanced coutnries are, the more ones are using the world's energy resources at the greatest rate. They are also the countries that will suffer the greatest effects when world supplies of oil, for example, run out , so energy conservation becomes important for every households.