1. Intergovernmental Panel on Climate Change. Climate Change 2021: the Physical Science Basis, https://www.ipcc.ch/report/sixth-assessment-report-working-group-i/.
2. International Energy Agency. World Energy Outlook 2021, https://www.iea.org/reports/world-energy-outlook-2021.
3. International Energy Agency. Net Zero by 2050: A Roadmap for the Global Energy Sector, https://www.iea.org/events/net-zero-by-2050-a-roadmap-for-the-global-energy-system.
4. The European Consortium of Innovative Universities. 2020: the natural year for climate action, https://eciu.net/insights/2020/2020-the-natural-year-for-climate-action.
5. BP. BP Statistical Review of World Energy 2019, https://www.bp.com/content/dam/bp/business-sites/en/global/corporate/pdfs/energy-economics/statistical-review/bp-stats-review-2019-full-report.pdf.