1. Global Carbon Budget 2015
2. United Nations “The Paris Agreement” to be found underhttps://unfccc.int/process-and-meetings/the-paris-agreement/the-paris-agreement 2015.
3. Federal Ministry for Economic Affairs and Energy (BMWi) “Renewable Energy Source in Figures. National and International Development 2017” to be found underhttps://www.bmwi.de/Redaktion/EN/Publikationen/renewable-energy-sources-in-figures-2017.html 2018.
4. ProcessNet-Arbeitsausschuss “Alternative flüssige und gasförmige Kraft- und Brennstoffe” “Advanced alternative liquid fuels: For climate protection in the global raw materials change” to be found underhttps://dechema.de/dechema_media/Downloads/Positionspapiere/2018_alternativeBrennstoffe_en.pdf 2018.