1. iea https://www.iea.org/data-and-statistics/data-tools/greenhouse-gas-emissions-from-energy-data-explorer May 1 2023
2. State of California https://ww2.arb.ca.gov/sites/default/files/barcu/regact/2019/act2019/fro2.pdf April 29 2023
3. Yuntian Zhang and Hui He https://theicct.org/china-ev-efforts-mar22/ 2023
4. UNITED NATIONS 2015
5. Council of the European Union 2023