CANCUN, Mexico - Top UN officials have set positive tones for the climate change conference as it reaches the last three days.

UN Secretary-General Ban Ki-moon said on Tuesday that the conference has made good progress in four areas.

The first is deforestation. "With adequate financial support, we can make this agreement work. Even if it's not a full agreement, we can make good progress," he said at a side event of the UN climate change summit in the Mexican beach resort.