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The United Nations Secretary-General António Guterres has issued a plea for action against climate change, as new research shows global average sea levels have already risen 9.4cm. Mr Guterres made the comments in Tonga this morning, as he attends the annual Pacific Islands Forum. Leaders from around the region have gathered for the summit, climate change at the top of the agenda. RNZ Pacific reporter Lydia Lewis is in Nuku alofa.