Write a short note on the conservation of energy?

The energy problems are increasing day by day. They are serious and can become critical in the coming time. We should follow certain energy saving programmes. The life style should be modified. One should preserve the energy by switching off the lights which are not required. The excessive consumption of oil should be checked. The oil must be protected from the fire. All other alternative sources of energy like the solar energy and different types of power like nuclear, wind and hydroelectric must be used more.