Chinese President Xi Jinping on Thursday addressed via videolink the opening ceremony of the high-level segment of the second part of the 15th meeting of the Conference of the Parties to the Convention on Biological Diversity (COP15), held in Canada's Montreal.

Stressing a sound ecosystem is essential for the prosperity of civilization, the Chinese president called for joint efforts to promote harmonious co-existence between man and Nature, build a community of all life on the Earth, and create a clean and beautiful world for mankind.

Here are some key quotes from Xi's speech.