Twenty years after the United Nations Conference on Environment and Development, "The Earth Summit", the Rio+20 conference in 2012 brought life back to sustainable development by putting it at the centre of a new global development partnership, one in which sustainable development is the basis for eradicating poverty, upholding human development and transforming economies. Written by practitioners and participants involved in the multilateral process of negotiations, this book presents a unique insider analysis of not only what happened and why, but also where the outcomes might impact in the future, particularly in the UN development agenda beyond 2015. The book throws light on the changing nature of multilateralism and questions frequent assumptions on how policy is defined within the UN. It shows that Rio+20 was more than an international meeting; it represented a culminating point of decades of successes and failures and a watershed moment for seminal concepts, ideas and partnerships including the Green Economy, zero tolerance on land degradation, the introduction of Sustainable Development Goals, the creation of national measurements of consumption, production and well-being that are intended to go beyond GDP, the introduction of national green accounting and the commitment of billions of dollars for sustainable development partnerships, including Sustainable Energy for All. The authors conclude by mapping out a new agenda for development in 2015, when the current Millennium Development Goals framework is due to expire. An agenda that will restore faith in the UN and inspire a global response to the demographic, economic and environmental challenges that will define our future in the decades to come.