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Dr Glenn Platt, who leads research on energy demand, said Australia got 80 per cent of its electricity by burning coal which pumps harmful emissions into the atmosphere.
He said: "Energy efficient bulbs, such as LEDs, and putting your Christmas lights on a timer are two very easy ways to minimise the amount of electricity you use to power your lights."
Dr Platt added: "For a zero-emission Christmas light show, you may consider using solar powered lights or sourcing your electricity from verified green power suppliers."