1. Bang, G. (2021). The United States: Conditions for accelerating decarbonization in a politically divided country. International Environmental Agreements, 21(2), 1–16. https://doi.org/10.1007/s10784-021-09530-x
2. Cohen, A. (2021). Europe’s self-inflicted energy crisis. Accessed 8 Nov 2021. Retrieved from https://www.forbes.com/sites/arielcohen/2021/10/14/europes-self-inflicted-energy-crisis/?sh=449301412af3
3. Energy crisis in Europe. (2021). Energy crisis in Europe: Causes and consequences. In Aussiedlerbotte Zeitung. Accessed 15 Nov 2021. Retrieved from https//aussiedlerbote.de/2021/10/energeticheskij-krizis-v-evrope-prichiny-i-posledstviya/
4. Executive order on tackling the climate crisis at home and abroad. (2021). Accessed 8 Nov 2021. Retrieved from https: www.whitehouse.gov/briefing-room/presidential-actons/2021/01/27/executive-order-on-tackling-the-climate-crisis-at- home-and-abroad
5. Federal Ministry. (2021). Federal ministry for the environment, nature conservation and nuclear safety. National climate policy. In German Federal Ministry for the Environment, Nature Conservation and Nuclear Safety. Accessed 8 Nov 2021. Retrieved from https://www.bmu.de/en/topics/climate-adaptation/climate-protection/national-climate-policy