Here are some simple things that you can do to save energy in a classroom...
*If you don't need them or when you are not in the room, turn the lights off.
*When it is hot, turn off the lights or open a window instead of air conditioning.
*When it is cold, close the door and Windows to keep more heat in.
*Put recycling bins for cans (if food / drinks are allowed in the class) and especially for paper materials to be recycled.
*If you have a sink, don't let the water run.
*Unplug things (projectors, computers, lamps, and things that go into a wall outlet) - if possible - when they are not in use.
*Use energy-efficient light bulbs.
You can turn off the lights when looking at the board.
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