Sergio Serra, Brazil's ambassador of climate change, has an exclusive interview with China Daily in Cancun. [Photo/ chinadaily.com.cn]

The reluctance of some countries for the second period of the Kyoto Protocol is the biggest stumbling block in the ongoing climate change negotiations, Brazilian Climate Change Ambassador Sergio B. Serra told China Daily on Wednesday.

It is true that the Kyoto Protocol is “the only binding treaty that we have to assure transparency and compliance with targets by developed countries,” said Serra, who has been involved in the climate change negotiations before the Bali talks in 2007.

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"But that does not reflect the 'whole picture' of global actions to slow down the climate change", he said.

"We have agreed to the Bali Roadmap for inscribing actions by developing countries, such as Brazil and China, and the United States, although it (the US) is not a member of the Kyoto Protocol," he said, emphasizing that Japan also signed the Bali Roadmap.

"We have to keep these negotiations going according to the mandate (the Bali Roadmap), which we all accepted before and which includes the second commitment period under the Kyoto Protocol," he said.

He also said emerging economies have played constructive roles in moving the negotiations forward.

Their accepting international consultation and analysis is a "big compromise" they made, he said. "We would like to see similar compromises on the other side – the developed nations."