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As we know,energy plays very important in our life.We use energy for lighting,cooking,boil water,...So each of us must cave energy.Fistly,we should turn of clectric appliancer when you don't use them,so you should go to school by bike or public transports instead of going,by car or motobike.thirdly,you should we solar energy to cook or heat water because it is cheap,clean eyretive source of energy.If we save energy,we save a lot of  money

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         Solar energy obtained on Earth is the energy of the electromagnetic radiation flowing from the Sun to Earth.The energy of the photons can be absorbed and converted into energy in the chemical bonds of photo-chemical reactions.Solar energy is also absorbed by Earth's hydrosphere and the Earth's atmosphere to generate meteorological phenomena that can be exploited. In this energy model, Earth, like the kettle of the first heat engines, converts the heat absorbed from the sun's photons into the kinetic energy of water, air and air streams. A form of leveraging the flow of rivers and streams before hydropower was born was a water mill. The flow of the sea can also move the generator of the power plant using the flow of the sea. Before wind generators were born, windmills were used to grind grain. Wind energy also causes wave motion on the surface. This movement can be utilized in marine power plants.The Earth's oceans have their own heat capacity greater than air and thus change the temperature more slowly than air when absorbed by the same amount of heat from the Sun.The freshwater-saltwater power plant collects this energy when it returns the fresh water of the river.