COPENHAGEN: China's climate ambassador cited a six-word Chinese idiom three times at a press conference yesterday to ask developed countries to honor their commitment to assist developing nations fight global warming.

Yan bi xin, xing bi guo: Promise must be kept (honored); actions must be resolute, Yu Xintai said.

Rich countries should abide by promises made a decade ago to cut emissions and provide green technology and financing to developing nations, he said.