The article discusses the concept of sustainability, looking at how it's defined in research. Sustainability means taking care of the economy, environment, and society while keeping the system working well. The authors talk about different ideas and debates on sustainability. They propose a new way to think about sustainability by focusing on logical conditions for a system to be sustainable. They also talk about concepts like autopoiesis and sustainable development. The key point is that sustainability is about keeping things going in a good way for the long term, looking at all parts of the system and how they work together.