5. Conclusion
The debate about sustainability economics, triggered by Baumgärtner and Quaas (2010a), has led to a number of publications that discuss various aspects of sustainable development and ecological economics. Söderbaum (2015) has written a commentary to my review paper (Remig, 2015). I agree with many of his arguments and join his call that we need more radical ecological economics. I also agree that a discussion about the definition of economics is relevant for ecological economics. To Peter Söderbaum's proposal, I add the reference to Ronald Coase, who defined economics as a discipline that seeks to understand the working of the economic system. I strongly reject the suggestion that my arguments lead to a mainstreamed version of ecological economics. Interdisciplinarity, diversity, complexity, empiricism, and radicalism are all constitutent features of ecological economics.