1. [1] Internet Web-Site: https://www.un.org/sg/en/content/sg/statement/2020-11-19/secretary-generals-remarks-climate-action-european-council-foreign-relations, The secretary-general remarks on climate action to European Council on Foreign Relations, 19 November 2020.
2. [2] Internet Web-Site: https://www.theguardian.com/environment/2020/dec/12/un-secretary-general-all-countries-declare-climate-emergencies-antonio-guterres-climate-ambition-summit, UN secretary-general urges all countries to declare climate emergencies, 12 December 2020.
3. [3] Internet Web-Site: https://www.rhc-platform.org/content/uploads/2020/10/RHC-ETIP-SRIA-2020-WEB.pdf, Sria for the renewable heating and cooling sector, European Technology and Innovation Platform, 12 April 2021.
4. [4] Uyar, TS. Accelerating the Transition to a 100% Renewable Energy Era. Cham, SWITZERLAND: Springer International Publishing, 2020.
5. [5] Internet Web-Site: https://www.rhc-platform.org/content/uploads/2019/04/RHC_Common_Roadmap.pdf, Common Implementation Roadmap for Renewable Heating and Cooling Technologies European Technology Platform on Renewable Heating and Cooling, RHC Platform, Brussels, 12 April 2020.