1. Adoption of the Paris agreement. Framework convention on climate change;United Nations,2015
2. Climate Action Plan 2050 - principles and goals of the German government's climate policy;BMU,2016
3. Energy Concept for an Environmentally Sound, Reliable and Affordable Energy Supply;German Federal Goverment,2010
4. Overview of the development of the energy-related emissions and fuel usage in Germany 1990–2016;UBA,2018
5. Renewable Power-to-Gas: a technological and economic review;Götz;Renew Energy,2016