There are currently three United Nations

United Nations

The United Nations is an international organization whose stated aims are facilitating cooperation in international law, international security, economic development, social progress, human rights, and achievement of world peace...

 Special Envoys on Climate Change, appointed by Secretary-General

United Nations Secretary-General

The Secretary-General of the United Nations is the head of the Secretariat of the United Nations, one of the principal organs of the United Nations. The Secretary-General also acts as the de facto spokesperson and leader of the United Nations....

 Ban Ki-moon

Ban Ki-moon

Ban Ki-moon is the eighth and current Secretary-General of the United Nations, after succeeding Kofi Annan in 2007. Before going on to be Secretary-General, Ban was a career diplomat in South Korea's Ministry of Foreign Affairs and in the United Nations. He entered diplomatic service the year he...

 on May 1, 2007. The envoys

Diplomatic rank

Diplomatic rank is the system of professional and social rank used in the world of diplomacy and international relations. Over time it has been formalized on an international basis.-Ranks:...

 will be engaging in consultations with Governments and other organizations in order to assist the Secretary-General to progress the international negotiations towards a post-Kyoto climate change treaty.

Gro Harlem Brundtland

Gro Harlem Brundtland

Gro Harlem Brundtland is a Norwegian Social democratic politician, diplomat, and physician, and an international leader in sustainable development and public health. She served three terms as Prime Minister of Norway , and has served as the Director General of the World Health Organization...

 is a former Prime Minister of Norway

Prime Minister of Norway

The Prime Minister of Norway is the political leader of Norway and the Head of His Majesty's Government. The Prime Minister and Cabinet are collectively accountable for their policies and actions to the Sovereign, to Stortinget , to their political party, and ultimately the...

 and former chair of the World Commission on Environment and Development

Brundtland Commission

The Brundtland Commission, formally the World Commission on Environment and Development , known by the name of its Chair Gro Harlem Brundtland, was convened by the United Nations in 1983...

. Han Seung Soo served as President of the United Nations General Assembly

President of the United Nations General Assembly

The President of the United Nations General Assembly is a position voted for by representatives in the United Nations General Assembly on a yearly basis.- Election :...

 in 2001, and also as Minister of Foreign Affairs of the Republic of Korea. Ricardo Lagos

Ricardo Lagos

Ricardo Froilán Lagos Escobar is a lawyer, economist and social democrat politician, who served as president of Chile from 2000 to 2006. He won the 1999-2000 presidential election by a narrow margin in a runoff over Independent Democrat Union candidate Joaquín Lavín...

, former President of Chile

President of Chile

The President of the Republic of Chile is both the head of state and the head of government of the Republic of Chile. The President is responsible of the government and state administration...

is the third Special Envoy.

The appointment of Lagos was controversial among Chilean environmental groups who questioned his track record on the matter, claiming that he 'showed an utter lack of consideration for the environment, promoted policies against environmental sustainability and favored the interests of big economic groups, even defending crimes against nature internationally'.