February 2010: The first meeting of the Issue Management Group on Sustainability Management takes place in Geneva

December 2009: The first report on the UN's Greenhouse Gas emissions - Moving Towards a Climate Neutral UN - is published at COP15 in Copenhagen in December. The General Assembly makes a decision on the future of sustainable procurement within the UN system.

2-4 September 2009: The High Level Committee on Management (HLCM) approves a recommendation from the Environment Management Group to transition from a Climate Neutral Strategy to a Sustainability Strategy. The organization also commits all agencies to publish Emission Reduction Strategies by the end of 2010.

16-17 September 2009: The first meeting of all informal 'Green Groups' from across UN agencies takes place in Geneva, marking the first step in the development of a UN-wide internal communications strategy on sustainability.

2009: The Environment Management Group (EMG) and Sustainable United Nations team work with all UN agencies to develop their greenhouse gas inventories via the Issue Management Group on Climate Neutral UN. Many agencies also start work on Emissions Reductions Plans.

February 2008: UNEP's Division of Technology, Industry and Economics (DTIE), in liaison with the EMG secretariat, establishes the Sustainable United Nations (SUN) facility with the aim of improving the sustainability performance of the UN Secretariat Offices and agencies.

26-27 October 2007: The Chief Executives Board (CEB) approves the Climate Neutral Strategy, which commits all UN agencies to measure and report their greenhouse gas emissions by the end of 2009.

9 July 2007: The Secretary-General sends a letter to the executive heads of all UN agencies asking them to join him in this effort. He asks Achim Steiner, Executive Director of UNEP and Chair of the Environment Management Group (EMG), to accelerate the coordination of activities across all UN agencies.

5 June 2007 (World Environment Day): The UN Secretary-General, Ban Ki-moon, announces his plan to make the UN Headquarters climate neutral and environmentally sustainable. He states that the initiative should include the other UN headquarters and offices around the globe and says the organization should "lead by example".