Ecological economics is concerned with socio-ecological systems. In other words, it analyzes the relationship of the economy to other social and natural systems from a systems perspective. Economic activity is always embedded in a larger context. Production requires resources and energy that are taken from nature and produces waste that ends up in the natural environment. In addition, the economy is influenced by values, opinions and beliefs that shape economic policies and institutions. From the perspective of ecological economics, sustainability can only be discussed with a systemic view. Therefore, systems thinking is a critical skill that will be trained in this module. We start with simple dynamic models of the economy, which are then extended to include aspects of social and natural systems. We use the software Vensim for this purpose. These extended socio-ecological models will be used to discuss sustainability policies.