1. U.S. Energy Information Administration, Energy and the environment explained, https://www.eia.gov/energyexplained/energy-and-the-environment/where-greenhouse-gases-come-from.php; 2021 [accessed 19 February 2022].
2. Sustainability of the four generations of biofuels – a review;Aron;Int J Energy Res,2020
3. A review on bioconversion processes for hydrogen production from agro-industrial residues;Saravanan;Int J Hydrog Energy,2021
4. Independent Group of Scientists Appointed by the Secretary-General, Global Sustainable Development Report 2019: The Future Is Now – Science for Achieving Sustainable Development, United Nations, New York; 2019.
5. Our World in Data, Cars, planes, trains: Where do CO2 emissions from transport come, https://ourworldindata.org/co2-emissions-from-transport#:∼:text=Since%20the%20entire% 20transport%20sector,of%20total%20CO2%20emissions; 2020 [accessed 19 February 2022].