1. United States Energy Information Administration , Use of Energy Explained, Energy Use for Transportation , https://www.eia.gov/energyexplained/use-of-energy/transportation.php , accessed August 7, 2021
2. United States Environmental Protection Agency , Sources of Greenhouse Gas Emissions , https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emissions , accessed May 20, 2021
3. S.Gross , The Challenge of Decarbonizing Heavy Transport, Brookings, 2020 , https://www.brookings.edu/wpcontent/uploads/2020/09/FP_20201001_challenge_of_decarbonizing_heavy_transport.pdf , acessed June 11, 2021
4. International Energy Agency , Transport Biofuels , https://www.iea.org/reports/transport-biofuels , accessed August 7, 2016
5. U.S. Department of Energy , 2016 Billion-Ton Report: Advancing Domestic Resources for a Thriving Bioeconomy, Volume 1: Economic Availability of Feedstocks , M. H. Langholtz, B. J. Stokes, and L. M. Eaton (Leads), ORNL/TM-2016/160, Oak Ridge National Laboratory , Oak Ridge, TN , DOI: 10.2172/1271651, http://energy.gov/eere/bioenergy/2016-billion-ton-report