The energy we mainly use is electricity, which is produced mainly by coal. Coal is one of the limited resources which is going to be fully consumed in the future. Therefore, we should do more things to save energy.
We can do so many things to save energy. If the weather is windy, we should open the windows instead of switch on the air-conditional.When the students leave the classroom, they should switch off all the fans and lights. We can save the energy by using fluorescent lights ihstead of bulbs,using microwave oven or ihduction cooker to cook or even using glass curtain walls for buildings.