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What I do

I investigate the characteristics of socially and environmentally sustainable economies and how we can organize the transitions from today's systems to new, sustainable ones. In my work, I combine quantitative and qualitative empirical research with inter- and transdisciplinary methods. My research focuses, among other topics, on green growth and degrowth, the digital transformation of the economy, and the political economy of right-wing authoritarianism.

Steffen Lange

My work is not only discussed within academia but also resonates with organizations such as the World Bank, UNEP, the European Commission, the European Environmental Bureau, and the German Federal Ministry for the Environment. I am a frequent public speaker and collaborate closely with policymakers and civil society actors - aiming not just to study sustainable economies, but to help bring them to life.

In addition to my position at the University of Siegen, I serve as the country representative for Germany at the European Society for Ecological Economics and as a board member of Common Future and Impact AI. Previously, I conducted research at the Technical University of Berlin, the University of Münster, and the Institute for Ecological Economy Research. I hold a PhD from the University of Hamburg.

Portrait von Charlotte Leubuscher 1931.

Expelled, forgotten, rediscovered

Charlotte Leubuscher was a pioneer of economics. She was the first female economist to habilitate in Germany and yet she is hardly known. The University of Siegen named a building after her and is bringing this extraordinary scientist back into the spotlight.

Master info events on 25.3., 30.4. and 28.5.

15.4.-17.4. symposium "Transformative Economics"

Info-Flyer Alumni Talk 18.2.2026

18.2 Alumni Talk: Science & Research

Heiner Flassbeck Bild

29.01. Lecture by Prof. Dr. Heiner Flassbeck

Introduction to feminist economics: work, time use and poverty measurement

Spring School "Ecology and transformation: challenges in business and society"

Study

Info event Master Plural Economics

Merz_Wachstumsbooster

Growth booster?

A commentary by Dr. Steffen Lange on the "growth booster/investment booster" from the German government.

https://www.instagram.com/reel/DMGJxHksi1p/?utm_source=ig_web_copy_link&igsh=MzRlODBiNWFlZA==

My research profile

My research is on the economics and political economy of a social-ecological transformation. It starts with (1) environmental sustainability questions, such as which measures would mitigate climate change, how these can be implemented and what this has to do with economic growth. In parallel, (2) I examine how economic systems can be (re)structured to ensure social justice and enable a good life for all, while simultaneously confronting the rise of anti-democratic movements that threaten these goals. Finally, (3) I investigate how these challenges intersect with the ongoing technological revolution in digitalization and artificial intelligence.

 

 

(1) Economic Growth and the Environment: Climate Mitigation, Decoupling and Post-Growth Economics

The relationship between economic growth and environmental sustainability raises the question of whether growth helps reduce environmental throughput or whether there are inherent limits to growth. Since my early years as a student, I have been concerned with these issues, focusing in my dissertation on the macroeconomic conditions for sustainable economies without growth. Currently, I investigate how climate neutrality pathways intersect with economic growth. Climate change has made it clear that incremental adjustments are insufficient to prevent catastrophic consequences, which has created a high demand for transformative ideas. Post-growth economics, as the science of sustainable economies without growth, seeks to address this challenge by radically decreasing environmental throughput while fostering social justice and strengthening democracy in both economic and political institutions.

 

(2) The Political Economy of Right-Wing Authoritarianism: Causes and Policy Responses

In numerous countries, right-wing authoritarian parties have been gaining political prominence. Concurrently, discussions surrounding the concept of "anti-fascist economics" have garnered increasing attention. This study addresses two closely related research questions: first, what are the economic factors driving the rise of these movements, and second, to what extent-and through which mechanisms-can economic policies mitigate or counteract this trend?

 

(3) Digitalization, Artificial Intelligence and Sustainability

Does digitalization and AI make our economy more sustainable by increasing energy and resource efficiencies? Or is it the other way around - more digital devices consume more energy and additionally lead to rebound effects and economic growth? We also need to ask how social inequalities are effected and whether we face new challenges regarding concentration of economic and political power. In light of such analyses, I develop concepts how digitalization can be used for a social-ecological transformation.

In brief:

  • Digitalization, AI and Sustainability

  • Climate Mitigation, Decoupling and Post-Growth Economics

  • The Political Economy of Right-Wing Authoritarianism: Causes and Political Responses

 

Books

Macroeconomics Without Growth
2018

Macroeconomics Without Growth

Sustainable Economies in Neoclassical, Keynesian and Marxian Theories
How can we organize our economies without growth? "Macroeconomics Without Growth' provides a comprehensive understanding of how non-growing economies can be sustainable. With this book, Steffen Lange brings new momentum into the debate on post-growth, degrowth and steady state economies. The book delves deep into economic theory to understand how a macro-economy can operate without growth. By applying a highly diverse set of theories - from Neoclassical, Keynesian and Marxian traditions - the book is able to cover a wide range of macroeconomic aspects: Is zero growth possible in a capitalist economic system? What happens to aggregate demand and aggregate supply when economies stop growing? And what role do firms, markets and technological change play in post-growth economies?

 
 
 

Smarte Grüne Welt
2018

Smarte grüne Welt

Digitalisierung zwischen Überwachung, Konsum und Nachhaltigkeit
Die Digitalisierung ist einer der gesellschaftlichen Megatrends - darin sind sich alle einig. Doch was bedeutet sie ganz konkret für Ökologie und Gerechtigkeit? Führt die Digitalisierung in eine smarte grüne Welt, in der alle vom technologischen Fortschritt profitieren und wir zugleich schonender mit der Umwelt umgehen? Oder steuern wir auf einen digitalen Turbokapitalismus zu, in dem einige wenige Geld und Macht in Händen halten und die Wirtschaft noch weiter über die planetaren Grenzen hinauswächst?

 
 
 

Digital Reset
2018

Digital Reset

Redirecting Technologies for the Deep Sustainability Transformation
Time seems out of joint. The world society has experienced a centennial pandemic, the global thermometer has displayed a sequence of hottest years on record, and Russia's war on Ukraine has shattered political order. Unsurprisingly, the economy is severely affected. Governments worldwide hope that digital technologies can provide key solutions. Yet this report shows that digitalisation, in its current and mainstream form, is rather aggravating than solving many of the pressing social and environmental crises at hand. What is needed instead is a deep sustainability transformation

Videos

Here you find a selection of videos.
You can find more here: Steffen Lange Youtube

Publications

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Book chapter
2020

Social justice through automation and algorithms?

Report
2020

Social well-being within planetary boundaries

Journal article
2020

Beyond a-growth Sustainable zero growth

Book chapter
2020

Eckpunkte und Positionen einer Vorsorgeorientierten Postwachstumsökonomie

Book chapter
2020

Saving nature with bits and bytes?

Book chapter
2020

Raus aus dem Elfenbeinturm! Mit der “Third Mission” zur Wachstumsunabhängigkeit

Journal article
2020

Digitalization and the Decoupling Debate: Can ICT Help to Reduce Environmental Impacts While the Economy Keeps Growing?

Book chapter
2020

Hidden drivers of digitalization

Book chapter
2020

Towards soft digitalization

Journal article
2020

Digitalization and energy consumption. Does ICT reduce energy demand?

Book chapter
2020

Agenda for a network society

Book
2020

Smart Green World?

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Endemic legacies: malaria's forgotten impact on cultural and social practices

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Forgotten collaborations?

No person profiles available at the moment.

Contact us

Postal address

University of Siegen
Schools III
Kohlbettstraße 17
57072 Siegen

Visitor address

University of Siegen
Faculty III

US-G 115
Kohlbettstraße 17
57072 Siegen

Secretariat

Phone +49 271 740-5288

E-mail: lange@wiwi.uni-siegen.de