The Summit of the Future (SOTF) is a unique and vital opportunity for the world community to update and upgrade the United Nations (UN) to meet the great challenges of the 21st Century.  We are midway between the founding of the UN in 1945 and the year 2100.  This is a key moment to take stock of the accomplishments and limitations of the UN to date, and to update and upgrade the UN institutions for the balance of the century.  The UN Sustainable Development Solutions Network (SDSN) is pleased to present its recommendations for United Nations 2.0 as a contribution to