Since the publication of its first edition in 1950, the Annual Review of United Nations Affairs (ARUNA) has stood as the authoritative resource for scholars, students, and practitioners researching the latest developments of that august body. From the insightful introduction, prepared each year by a Guest Author and distinguished expert on UN affairs, to the full-text presentation of reports and resolutions and the helpful subject index, ARUNA provides a practical tour of each year's U.N. actions and debates. ARUNA presents a comprehensive documentation of the work of the UN on an annual basis, covering the General Assembly, the Security Council, the Economic and Social Council (ECOSOC), the International Court of Justice, and the UN Secretariat. Solely official UN documentation is used. ARUNA occupies a special place in the publications on the work of the UN--it allows readers to obtain an overview of the principal developments in its key organs. This year's Guest Author is Professor Jeffrey D. Sachs on "Towards a new global protocol on climate change". Professor Sachs is Director of the Earth Institute at Columbia University and Special Advisor to the Secretary-General of the UN on the Millennium Development Goals. Previous Guest Authors include Professor Edward C. Luck, UN Special Advisor on the Responsibility to Protect, Vice President and Director of Studies at the International Peace Academy and former President and Chief Executive Officer of the UN Association of the USA; Ms Louise Frechette, Distinguished Fellow at the Centre for International Governance Innovation, Waterloo, Ontario and former Deputy Secretary-General of the UN; and Mr Rubens Ricupero, Dean of the Fundacno Armando Alvares Penteado (FAAP), Sao Paulo, and former Secretary-General of UN Conference on Trade and Development (UNCTAD) and Minister of Finance of Brazil.