Australia is the only country using carryover climate credits, officials admit

More than half of Australia's Paris emissions commitment will come from controversial credits from previous targets

The federal environment department says it is not aware of any countries other than Australia planning to use controversial "carryover credits" to meet international climate commitments.

The comment, at a Senate estimates hearing on Monday, comes as the Morrison government rebuffs calls from international leaders, analysts and activists for it to abandon the use the credits to meet its 2030 Paris emissions goal.