1. IEA. World Energy Outlook 2019, 2019. https://www.iea.org/reports/world-energy-outlook-2019/gas (accessed April 2, 2020).
2. IEA. Transportation sector energy consumption, 2016. https://www.eia.gov/outlooks/ieo/pdf/transportation.pdf (accessed
April 3, 2020).
3. EIA. How Much Carbon Dioxide is Produced When Different Fuels are Burned? 2019. https://www.eia.gov/tools/faqs/faq.php?id=73&t=11 (accessed April 2, 2020).
4. Technical overview of compressed natural gas (CNG) as a transportation fuel
5. Advanced Research Projects Agency-Energy. REMOTE Program Overview, 2013. https://arpa-e.energy.gov/sites/default/files/documents/files/REMOTE_ProgramOverview.pdf (accessed April 4, 2020).