IT sounds too far-fetched to be true, but it's all too real – a fake private jet design firm has hoodwinked its way into a COP26 net-zero initiative alongside major corporations in a protest against greenwashing.

A website advertising bogus company Yasava shows a baby in a luxurious office set within an aircraft and makes nonsensical scientific claims while appearing to cater to the world's wealthiest.

And yet it's been accepted as an official member of two different UN initiatives that see businesses including Heathrow and BAE Systems set "science-based" targets to reach net-zero carbon emissions by 2050.

It's the work of activist pranksters The Yes Men and, according to campaigners, raises serious questions about corporate greenwashing at the climate summit in Glasgow. Greta Thunberg dubbed it a "greenwash festival of empty promises".

"Finding out that Yasava was created by The Yes Men actually made sense because this bespoke private jet interiors company was clearly too preposterous to be real," says Alan Bell of Glasgow Calls out Polluters. "But yet this fantastical company seems fit to pass the ‘science-based’ verification processes of these two net-zero initiatives without any serious due diligence or obvious questions asked."

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Yasava claims to be based in Switzerland and to have aircraft models that actually produce oxygen rather than carbon dioxide. Its Aizen line results in "a sub-zero CO2 carbon footprint, effectively contributing to pro-active reversal of atmospheric greenhouse gas (GHG) effects, resulting in a net positive oxygen atmospheric balance", it claims.

And it claims to use blockchain to help customers offset their carbon emissions.

"Imagine flying through the atmosphere in ultimate comfort, without leaving a trace of a carbon footprint in your wake. This paradox seems illogical, and yet we say that it shouldn’t be," the marketing copy states.

"This should be a moment of profound embarrassment for COP26 and the corporate hype around net-zero," says Bell. "If the most ridiculous company imaginable can meet the flagship net-zero standard, then we should not take the concept of net-zero seriously at all."

The Race to Zero Programme and Science-Based Targets Initiative have drawn criticism for featuring companies such as Heathrow Airport (amongst other airport owners), COP26 sponsors SSE, Microsoft and Natwest, as well as Drax, the UK’s largest carbon emitter. This prank, campaigners say, provides a serious condemnation of the drive to reach net-zero by 2050.

"A private aircraft or fleet is an absolute necessity for many executives and companies," Yasava's no-existent CEO Christopher Mbanefo is quoted as saying.

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"With our bespoke interiors, planes can transform from mere means of elite long-distance transport into expressions of one's deepest, most timeless concerns, whether regarding the climate or any other issue that means life or death for humanity."

"We pride ourselves on our ability to help executives become the ultimate realization of themselves, thus facilitating their ability to take action against danger in, and to, an increasingly uncertain world," said Yasava fictional tailor-in-chief Yann Hermann adds.

"Do they fly often? Constantly? As a second home, or even a second skin, a well-designed aircraft interior can give an executive the wellbeing to enable quantum leaps in human concern that our planetary survival requires."

Andy Bichlbaum of the Yes Men said: "It was hard to get Yasava accepted by these COP26 initiatives, but we played it cool and pulled all of our usual social-engineering feats in sequence — and boom, they were in.

"In all the history of all our efforts, this was the first time we'd managed to get a fake company accepted at this extremely high level."

The UN Climate Change and COP26 press teams have been contacted for comment.