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In page United Nations Conference on Sustainable Development:

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The ten-day mega-summit, which culminated in a three-day high-level UN conference, was organized by the United Nations Department of Economic and Social Affairs and included participation from 192 UN member states – including 57 head of state and 31 head of government,[citation needed] private sector companies, NGOs and other groups. The decision to hold the conference was made by UN General Assembly Resolution A/RES/64/236 on 24 December 2009. It was intended to be a high-level conference, including heads of state and government or other representatives and resulting in a focused political document designed to shape global environmental policy.[5]