Their claim to be eco-warriors has been met with cynicism in recent times.
Sting, for instance, notched up an incredible number of air miles with his band's world tour.
And it was revealed that his wife Trudie Styler travels between their seven homes in private jets or their fleet of cars, as well as importing farm produce hundreds of miles.
Now the celebrity couple have been forced to admit that their record is less than clean.
Miss Styler, 53, was challenged on the issue when extolling the benefits of organic and locally-grown food.
The interview at the Earls Court Real Food Festival had been going well, until one journalist pointed out that the couple's carbon footprint has been estimated as 30 times greater than the average Briton's.
Miss Styler tried to shift a little of the blame on to her musician husband, who is 56.
"When it comes to the carbon footprint, Sting puts his hand up immediately and says 'I'm a musician and I have a huge carbon-footprint",' she said.
She then asked: "Are we being hypocritical?' before seeming to answer the question herself.
"He has a 750-person crew to bring around the world and it is a difficult challenge.
"I would like to think that we both work pretty hard for the rights of indigenous people and for the rights of conservation of the Amazon rainforest, but we do need to get around. It's a difficult one."
Environmental experts labelled Sting's band, The Police, the dirtiest in the world because of the amount of pollution created during last year's reunion tour of the U.S., Canada, Mexico, Sweden, Germany, the UK, Brazil, Chile, Argentina, Australia, New Zealand, China and Japan.
Miss Styler failed to mention in Thursday's interview that she and their family joined him on much of it.
She also forgot to add that a cavalcade of horseboxes has been known to travel between their Wiltshire pile, The Lake House, and their Tuscan estate twice a year when the family decamps for the summer.
Or indeed, the fact that the organic food she grows on the Italian-estate has to be transported to London for sale in Selfridges.
She was also accused in a recent tribunal of forcing her chef to travel 100 miles to prepare a bowl of pasta.
However, Miss Styler clearly feels she is doing her bit for the planet - and managed to offer some advice on the subject, too.
She said: "I think within the next year we have a period of huge responsibility for this country to keep GM at bay.
"We spend a lot of time in America and you often don't know when you are eating GM food. I say keep GM out of Britain."
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