1. The International Energy Agency, 2016. https://www.iea.org/newsroom/news/2016/october/iea-raises-its-five-year-renewable-growth-forecast-as-2015-marks-record-year.html. (Accessed 1 May 2018).
2. IEA, 2020. https://www.iea.org/reports/world-energy-outlook-2020. (Accessed 17 February 2021).
3. Carbon emissions will reach 37 billion tonnes in 2018, a record high, phys.org;Canadell,2018
4. Hydrogen from renewables: a case study of glycerol reforming;Fasolini;Catalysts,2019
5. Renewable infrastructure investment handbook;World Economic Forum,2016