WHO launched a new comprehensive analysis of global health trends since 2000 and an assessment of the challenges for the next 15 years. "Health in 2015: from MDGs to SDGs" identifies the key drivers of progress in health under the United Nations Millennium Development Goals (MDGs). It lays out actions that countries and the international community should prioritize to achieve the new Sustainable Development Goals (SDGs), which come into effect on 1 January 2016. The 17 SDGs are broader and more ambitious than the MDGs, presenting an agenda that is relevant to all people in all countries to ensure that "no one is left behind." The new agenda requires that all 3 dimensions of sustainable development – economic, social and environmental – are addressed in an integrated manner.