More than 60 international climate change negotiators will meet in Auckland next week.

The deal reached at global climate change talks in Copenhagen has disappointed politicians and scientists worldwide, while reaction has been mixed in New Zealand.

Prime Minister John Key has described the deal as "short of the aspirations and expectations" people held, while the Green Party's former co-leader Jeanette Fitzsimons has labelled it a "tragedy for humanity."

Labour Party climate change spokesman Charles Chauvel, who also attended the conference, said the deal could be built on.

Japan is the most sustainable country in the Asia Pacific within the G20 countries, global researcher IDC announced at the United Nations Climate Change Conference in Copenhagen on Friday.