Sustainable development is a global political concept, a normative framework for aligning human well-being with the well-being of the natural environment over the long-term. As a political concept, sustainable development remains contested. The UN Sustainable Development Goals (SDGs) might appear to be clear and unambiguous goals for political and business decision makers, yet there is a central contradiction at their core: economic growth driven through investments and market forces is intended to help us achieve a more sustainable development, yet the consequences of economic growth in the past have create global ”un-sustainabilities” when it comes to climate change, loss of biodiversity but also economic inequalities within and across countries. From its beginning, the modern sustainable development discourse had a complicated relationship with growth, as can be seen in the first report to the Club of Rome titled ”Limits to Growth“, through the Brundtland Report’s understanding of sustainable development and some mild questions about the sustainability production and consumption patterns of the global north, all the way to our current notions of a green economy and green growth. Over the past decade and half, the alternative discourse on ”décroissance”, on degrowth or postgrowth, has gained traction in a variety of European countries and also made interesting connections to southern movements like Buen Vivir in South America or Radical Ecological Democracy (RED). In this contribution we will seek to understand the contradictions between sustainable development and economic growth, the limits to green growth, and the alternative perspectives for human, social and natural well-being degrowth can offer us. Keynote at Universidade Nove de Lisboa on 5 April 2018 at "Globalisation XXI: Connected Societies" conference.