The head of the UN body that leads on sustainability and green issues has been criticised for extensive and expensive air travel.

A draft internal audit, obtained by the Guardian and seen by the BBC, says that Erik Solheim’s actions risked the reputation of UN Environment.

The report says he incurred costs of $488,518 (£373,557) while travelling for 529 out of 668 days.

There was “no oversight or accountability” to monitor this travel.

Mr Solheim says he has paid back the money where “instances of oversight” occurred.