As the production of energy becomes more difficult and expensive, it naturally becomes more important to conserve the energy supplies we already have.
In countries like the United States, Australia and West Germany, for example, a very 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 developed countries are the ones that 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 people and every household
Generally, the average use of energy in the United States, per head of population, is about twice as great as in Australia
Energy can be saved in every home if we become aware of how much we use. For example, if simple insulating materials are used in building houses, especially in ceilings and walls, the energy used for heating and colling can be reduced by about a third over the year. As a large proportion of home energy use is for heating water, solar heaters can make a big contribution here. It is possible to link the solar heater with the normal system so that the main's supply is only used to supply what the solar heater cannot do, and this can make big savings.