Adherence to Paris accord key

The conference should verify developed countries' commitments in carbon emission reductions and any gaps in support they have pledged to developing countries before 2020. The gap must be closed without transferring any burden to developing countries after 2020, he said.

Zhao also called for developed countries to beef up financial support and enhance transparency.

"China will endeavor to overcome problems and challenges brought by unilateralism and protectionism and unswervingly roll out its national strategy on tackling climate change in a proactive manner," he said, adding that the country will continue to make arduous efforts to fully honor its commitments.