Secretary-General of the United Nations Antonio Guterres makes a special talk on sustainable development and climate change in Islamabad, Pakistan, on Feb. 16, 2020. The climate change is the gravest and most urgent obstacle to the global stability and prosperity, and greater joint efforts made by every country and every community in the world are necessary to deal with the crisis, UN Secretary-General Antonio Guterres said here on Sunday. (Photos: Xinhua)

Secretary-General of the United Nations Antonio Guterres answers questions after a special talk on sustainable development and climate change in Islamabad, Pakistan, on Feb. 16, 2020. The climate change is the gravest and most urgent obstacle to the global stability and prosperity, and greater joint efforts made by every country and every community in the world are necessary to deal with the crisis, UN Secretary-General Antonio Guterres said here on Sunday.

Secretary-General of the United Nations Antonio Guterres makes a special talk on sustainable development and climate change in Islamabad, Pakistan, on Feb. 16, 2020. The climate change is the gravest and most urgent obstacle to the global stability and prosperity, and greater joint efforts made by every country and every community in the world are necessary to deal with the crisis, UN Secretary-General Antonio Guterres said here on Sunday.