Adherence to Paris accord key

All negotiations at the conference should be carried out within the range of the Paris climate agreement, which was negotiated among parties to the UN Framework Convention on Climate Change, Zhao added.

If any party raises issues outside of the agreement, it will mean that the 2015 treaty, which has yet to be implemented, will have to be renegotiated, and it will take time to reach consensus, he said.

"If any parties would like to show their proactive attitude, they should do that by implementing the Paris agreement rather than by doing something else," he said.

Zhao also told his counterparts that the major cause for the inadequate progress in the world's efforts to fight climate change is the substantial gaps in honoring pre-2020 commitments.