In the keynote speech, Sigrid Stagl argues why it is necessary to include socio-ecological aspects in macoreconomic models. The talk focuses on the ecological necessities, mentioning limits to growth, resource extraction and planetary boundaries. At the end, Stagl shortly presents several current macroeconomic initiatives and models that move towards a a socio-ecological macroeconomics.

Nach einem kurzen wissenschaftstheoretischem Einstieg zur prä-analystischen Vision der Ökologischen Ökonomik, präsentiert Bernd Siebenhüner die Kernideen der Theorieschule. Dabei grenzt er diese von der Umwelt- & Ressourcenökonomik ab und erläutert auch Unterschiede zur Neoklassik. Während dieser Einführung in die Ökologische Ökonomik erläutert Siebenhüner Begriffe wie planetare Grenzen, Nachhaltigkeit oder Thermodynamik. Dabei gebt er insbesondere auf die Leitvision „Komplementarität statt Substituierbarkeit“ ein und stellt diese den in Kontext von schwacher und starker Nachhaltigkeit. Im Anschluss präsentiert Siebenhüner die Debatten um Wachstum und Ökosystemleistungen in der Ökologischen Ökonomik.

Robert Costanza briefly present various methods of environmental valuation, and talks about the changes in the global value of ecosystem services. He then introduces the major ecosystem services, and how different methods of valuation affect the preferred policies to address environmental issues.

The last 15 years have seen extensive research into ecosystem service valuation (ESV), spurred by the Millenium Ecosystem Assessment in 2005 (Baveye, Baveye & Gowdy, 2016). Ecosystem services are defined as “the benefits people obtain from ecosystems” (Millenium Ecosystem Assessment, p.V). For example, ecosystems provide the service of sequestering carbon which helps regulate the climate. Valuation means giving ecosystems or their services a monetary price, for example researchers have estimated that the carbon sequestration services of the Mediterranean Sea is between 100 and 1500 million euros per year. The idea of ESV was a response to the overuse of natural resources and degradation of ecosystems, allegedly due to their undervaluation and exclusion from the monetary economy. ESV can be used (1) for policy decision-making, for example allocating funding to a reforestation project (2) for setting payments to people who increase ecosystem services, for example a farmer increasing the organic carbon content of their soil, and (3) for determining fees for people who degrade ecosystem services, for example a company that causes deforestation.