The United Nations Intergovernmental Panel on Climate Change was set up in 1988 to monitor the effects of climate change and advise governments how to deal with them.
It has published four assessment reports, taking a global look at scientific matters in climate change and making predictions based on observation.
Its fifth report was officially released at 1pm today from Yokohama in Japan.
One chapter covers the effect of climate change on New Zealand and Australia and gives predictions for possible changes during the next century.
Predictions are graded from "low confidence" to "very high confidence".
More than 300 scientists from around the world are lead authors of the report. They assessed more than 9000 peer-reviewed papers to compile it.
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