1. Kok I (2017) Coal transition in the United States. An historical case study for the project “coal transitions: research and dialogue on the future of coal”. IDDRI and Climate strategies 2017,
www.coaltransitions.org
2. Kretschmann J (2000) Führung von Bergbauunternehmen (Management of Mining Enterprises). Wissenschaftsverlag Mainz in Aachen 2000 in German
3. International Energy Agency (2018) Coal 2018 Analysis and forecasts to 2023. https://
www.iea.org/coal2018/
[accessed 30 April 2019]
4. Shell (2018) Shell Scenarios. Sky. Meeting the Goals of the Paris Agreement. An Overview.
www.shell.com/skyscenario
5. Forsythe M (2017) China aims to spend at least $360 billion on renewable energy by 2020. In New York Times, Jan. 6, 2017, on page A6