Santa's flatulent reindeer will emit nearly 22 tonnes of CO2 as they burp and fart their way across the UK, boffins have calculated.
Professor Phil Garnsworthy, of the University of Nottingham, has worked out how much harmful methane Rudolph and his pals would belch out as they deliver presents.
He estimated Santa will cover 260,000 miles – or 419,000 kilometres – as he travels around the UK on the busiest night of his year.
After analysing a reindeer's diet of lichen, along with the energy content and density of methane, Prof Garnsworthy found emissions for each animal would be 0.207 g/km.
But methane is 28 times more potent as a greenhouse gas than carbon dioxide over a 100-year period.
As a result, each reindeer would emit 5.8g/km of CO2-equivalent as they burp their way around the UK – meaning Santa’s fleet of nine reindeers would be emitting 52g/km of CO2-eq overall.
Across the whole of the UK, Santa and his reindeers would emit the equivalent of 21.8 tonnes of CO2 as they travel the 419,000 kilometres in total.
This would roughly be enough to cook a turkey in 914,013 households.
A reindeer's emissions are slightly more than the 44g/km CO2 emitted by a typical plug-in hybrid, but less than a third of a typical petrol or diesel delivery van (158.4 g/km).
But Santa's sleigh would still be classed as a low emission vehicle by the government.
And if the treasury is interested in Santa’s transport, he’d face an annual tax bill of just £15 based on emissions.
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Professor Garnsworthy was commissioned to carry out the research by Fiat, ahead of the launch of its new zero emission E-Ducato van.
He said: “Rudolph, Vixen, Dasher and co have a very busy night of work ahead of them and the methane they will be emitting, while considerably more potent than CO2, is respectable considering the work they’ll be doing.
“They’re a lot more efficient than your average diesel van and they wouldn’t be subject to any congestion charges, but the sleigh they power is still a fair way off being zero emission.”
Richard Chamberlain, head of Fiat Professional UK, added: “We can rely on Santa and his reindeers to ensure families across the UK have a wonderful Christmas.
“It’s great to know that he and his reindeers emit the equivalent of 52g CO2 per km, which would classify the sleigh as an ultra-low emission vehicle.
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“But if he needs any assistance next year then the zero- emission, tax-free E-Ducato is more than up to the task.”
The Fiat E-Ducato, has a range of up to 192 miles between charges and space to carry up to 1,950kg of goods – the equivalent weight of around 400 X-Box Series X consoles or more than 5,000 pairs of slippers.
Reindeer emissions by the city
London – 742kg CO2 equivalent
Birmingham – 337kg CO2
Manchester – 379kg CO2
Glasgow – 166kg CO2
Newcastle 140kg CO2
Sheffield – 125kg CO2
Leeds – 122kg CO2
Liverpool – 98kg CO2
Bristol – 96kg CO2
Nottingham – 88kg CO2
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