A Chinese diplomat on Thursday voiced opposition to proposals made by several countries to bring Taiwan into the negotiation process of the UN Framework Convention on Climate Change as an observer.

Over 150 countries have addressed the high-level meetings at the Cancun climate conference in the past three days, an indication that the international community attaches great importance to the issue of climate change, Huang Huikang, special representative of the Chinese Foreign Ministry for climate change negotiations, told a meeting during the ongoing UN climate change conference.

"But we noticed to our regret that several countries which do not seem to really care about climate change have tried to mix the negotiations with political issues such as the issue related to Taiwan. They preached the ideas of 'Two Chinas' and 'One China, One Taiwan' in their speeches," Huang said.

It is known to all that there is only one China in the world and Taiwan is an inalienable part of it, the diplomat said.

"These speeches went against the purposes and principles of the UN Charter and relevant regulations of the UNFCCC, and constituted a violation of China's sovereignty and territorial integrity, and interference in its internal affairs," he said.

The Chinese government and people must make a firm stand against the speeches.

"As negotiations at the Cancun conference have a very tight schedule, we believe it is the parties' common aspiration to focus on the negotiations and consultations in order to reach positive results. They do not want to see the conference disrupted and hindered by factors unrelated to the agenda," he said.

Huang said the Chinese delegation hoped that countries concerned abide by the one-China principle, understand and support the Chinese government's efforts to safeguard the peaceful development of cross-Strait relations.

The diplomat also called for the countries to contribute to the peaceful development of cross-Strait relations rather than doing things that harm China's interests and hurt the feelings of the Chinese people.

The UN climate conference, running from Nov. 29 to Dec.10, aims to find solutions to global climate change.

The high-level meeting of the conference started Tuesday.