As does every breath exhaled by a terrorist.
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.
So does cow flatulence.
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."
I'd rather shoot terrorists and eat cows.
He said the nation's electricity came from "centralised carbon intensive, coal-based power stations" which were responsible for emitting over one third of Australia's greenhouse gas emissions.
Switch to nuclear.
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."
Or using candles.
Bite me.