1 jan 2022 ano - Sources

Descrição:

Marcy, Cara. "U.S. Renewable Electricity Generation Has Doubled Since 2008." U.S. Energy Information Administration, 19 March 2019, https://www.eia.gov/todayinenergy/detail.php?id=38752. Accessed 3 December 2019.

ProCon.org. "Historical Timeline: History of Alternative Energy and Fossil Fuels." ProCon.org, 24 September 2019, https://alternativeenergy.procon.org/view.timeline.php?timelineID=000015. Accessed 3 December 2019.

U.S. Energy Information Administration. "Geothermal Explained." U.S. Energy Information Administration, 10 June 2019, https://www.eia.gov/energyexplained/geothermal/use-of-geothermal-energy.php. Accessed 5 December 2019.

U.S. Energy Information Administration. "Hydrogen Explained." U.S. Energy Information Administration, 16 January 2019, https://www.eia.gov/energyexplained/hydrogen/use-of-hydrogen.php. Accessed 5 December 2019.

U.S. Energy Information Administration. "Hydropower Explained." U.S. Energy Information Administration, 4 April 2019, https://www.eia.gov/energyexplained/hydropower/where-hydropower-is-generated.php. Accessed 5 December 2019.

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