Australia could be on track to meet its Paris 2030 emissions reductions because of a loophole.

Prime Minister Scott Morrison has routinely stated Australia will achieve 2030 emissions reduction targets of 26 to 28 per cent “in a canter”.

But experts say this could be achieved by counting old credits, left over from the Kyoto targets, which Australia should meet with a large excess.

The concept of using past accounting systems to apply a future reduction has been slammed by the Climate Council, among others.

The concern comes at the same time as COP24 - the major annual summit on climate change is on in Katowice in Poland, which will continue hashing out the rules for the Paris accord.

Australia will be eagerly awaiting to see the extent to which surplus credits from previous scheme will count towards the 2030 targets.

Experts from the ANU, Victoria Energy Policy Centre and The Climate Council have discussed the possible loophole in an interview with the ABC.