Ministers and officials from New Zealand will be among representatives of 192 countries attending climate change talks in Mexico this week.
They're hoping for progress towards a new international treaty on reducing greenhouse gas emissions, after a meeting in the Danish capital failed to agree on a successor to the Kyoto Protocol.
Last year political leaders from around the world flew to Copenhagen, hoping their presence would help to finalise a legally binding treaty.
Instead, a hurried agreement - the Copenhagen Accord - was struck in the final hours of the meeting. It is not legally binding and sets no real targets to reduce greenhouse gas emissions.
This year's meeting is widely acknowledged as one which will keep up momentum, in the hope that a final deal can be stuck at next year's meeting in South Africa.