A recent draft internal audit, obtained by Britain’s Guardian newspaper and seen by the BBC, said he had incurred costs of $488,518 (£382,111) while travelling for 529 out of 668 days.

It said this harmed the reputation of UN Environment – a body that highlights green issues and sustainability.

There was "no oversight or accountability" to monitor this travel.

Mr Solheim, a Norwegian former environment minister, says he has paid back the money where "instances of oversight" occurred.

On Tuesday, Mr Solheim himself confirmed his resignation, Norway’s NRK broadcaster reported.

A formal UN announcement is expected shortly.

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