Penwythnos diwethaf defnyddiodd eich ysgol 4,000 kWh o nwy, a fydd wedi costio tua £140. Gofynnwch i reolwr y safle ddiffodd y gwres ar y penwythnos i arbed ynni!
Well done, you have scored 30 points so far and you're in 18fed position on the scoreboard. Complete your next activity to climb higher up the scoreboard!
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