Small signs made and displayed round the school to remind everyone to switch off lights and to close doors so that the lights go off straight away rather waiting for the delay.
Disgrifiad o'r gweithgaredd
Lawrlwythwch a lliwiwch y posteri hyn neu greu rai eich hun i'w harddangos yn eich ystafell ddosbarth, coridorau ysgol neu gartref.
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