One of Greenpeace's most senior executives commutes 400km each way to work by plane, the environmental group has admitted.
Pascal Husting, the programme director at Greenpeace International, said he began "commuting between Luxembourg and Amsterdam" when he took the job in 2012 and made the round trip about twice a month.
The flights, costing 250 ($390) return, are paid by Greenpeace, even though it campaigns to cut air travel, arguing the growth in flying "is ruining our chances of stopping dangerous climate change".
One volunteer described the arrangement as "almost unbelievable". Another was going to cancel their donation after a series of disclosures about financial mismanagement in documents leaked to the Guardian newspaper.
Greenpeace was forced to apologise for a "serious error of judgment" last week, after it emerged it had lost 3.75 million of public donations when a member of staff tried unauthorised currency dealing. KLM airline said each round trip Husting made would generate 142kg of carbon dioxide emissions - a carbon footprint equivalent over two years to consuming 17 barrels of oil, according to the US Environmental Protection Agency.