References:
- https://fuelcellsworks.com/news/in-2019-83-new-hydrogen-refuelling-stations-worldwide/
- https://www.iea.org/reports/hydrogen
- io Fuel Cell Electric Vehicle Calculations.xlsx
- https://www.nrel.gov/docs/fy13osti/56412.pdf
- https://fuelcellsworks.com/news/california-fcev-sales-fceb-hydrogen-station-data-as-of-june-1-2020/
- https://cafcp.org/blog/california-fuel-cell-revolution-vision-2030
