The World Economic Forum made the idea of a sustainable world the key theme for this year's event Davos, Switzerland.

But the financial, political, and celebrity elites that travel to the event will largely continue to travel by private jet, which is hugely damaging to the environment.

The WEF says it offsets the carbon emitted from flights by funding emissions-reducing projects, but this practice does not stop the carbon entering the atmosphere.

Swedish teenage climate activist Greta Thunberg will address the forum again, after she last year stunned global leaders by saying that many of them likely profit from sacrificing the environment.

The WEF says it has taken other steps, including electric cars, monitoring food waste, and using renewable electricity.

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The World Economic Forum said on Monday, one day before the event kicks off in Davos, Switzerland, that: "The climate crisis is going to be one of the dominant themes this week."

Its website prominently features Swedish teenage climate activist Greta Thunberg, who is due to appear this year after criticising world leaders and urged them to act at last year's event.

"How to Save the Planet" is one of the seven "key" themes up for discussion.

And the overall theme of this year's event is "Stakeholders for a Cohesive and Sustainable World."

But as the world's financial elite, political leaders, and celebrities descend on the small town, the question is whether their transport choices can at all work with what the event — and many of those leaders — say they want to achieve for the planet.

Planes carrying delegates attending the 2016 World Economic Forum in Davos, Switzerland, arrive at an airport in Zurich in January 2016. Marina Lystseva\TASS via Getty Images

The World Economic Forum recorded more than 600 plane journeys that can be attributed to Davos in 2019 — a figure that does not "take into account public figures such as presidents and prime ministers."

"There were around 60 of these but they tend to use military planes and land at a nearby military base, which makes it impossible to get flight numbers," Davos said.

Aviation is expected to contribute to 22% of the world's carbon emissions by 2050 .

World leaders, business leaders, and world-famous personalities are largely unlikely to copy Thunberg and take the train, as she did last year.

wedish youth climate activist Greta Thunberg arriving by train during the World Economic Forum (WEF) annual meeting in Davos, Switzerland, in January 2019. AGNES PEDRERO,ELOI ROUYER/AFPTV/AFP via Getty Images

That lack of willingness to make changes was condemned by Thunberg at last year's event, when she stunned the world's most powerful people at a lunch by pointing at their power to help fix the crisis.

"Some people say that the climate crisis is something that we will have created, but that is not true, because if everyone is guilty then no one is to blame. And someone is to blame," she said.

"Some people, some companies, some decision-makers in particular, have known exactly what priceless values they have been sacrificing to continue making unimaginable amounts of money. And I think many of you here today belong to that group of people."

The World Economic Forum says its offsetting the carbon from flights, and taking other environmental steps