This work is licensed under a
Creative Commons Attribution 4.0 International License
 H. Ritchie, M. Roser, Fossil Fuels - Our world in Data. Available: https://ourworldindata.org/fossil-fuels.
 A. Demirbas, Current technologies for thermo-conversion of biomass into fuels and chemicals, Energy Sources. 26 (2004) 715–730.DOI: https://doi.org/10.1080/00908310490445562
 T. Minowa et al., Oil production from garbage by thermochemical liquefaction, Biomass and Bioenergy. 8(2) 1995 117–120.DOI: https://doi.org/10.1016/0961-9534(95)00017-2
 A. Demirbas, M. Balat, K. Bozbas, Direct and catalytic liquefaction of wood species in aqueous solution, Energy Sources, Part A. 27(3) (2005) 271–277.DOI: https://doi.org/10.1080/00908310490441971
 S. Xiu et al., Hydrothermal pyrolysis of swine manure to bio-oil: Effects of operating parameters on products yield and characterization of bio-oil, Journal of Analytical and Applied Pyrolysis. 88(1) (2010) 73–79.DOI: https://doi.org/10.1016/j.jaap.2010.02.011
 S. Xiu et al., Oil production from duckweed by thermochemical liquefaction, Energy Sources, Part A. 32 (2010) 1293–1300.
 A.B. Ross et al., Hydrothermal processing of microalgae using alkali and organic acids, Fuel. 89(9) (2010) 2234–2243.
 F.M. Demirbas, Bio refineries for bio fuel upgrading: A critical review, Appl. Energy. 86 (2009) S151–S161.
 S. Xiu, A. Shahbazi, Bio-oil production and upgrading research: A review, Renewal and Sustainable Energy Reviews. 16 (2012) 4406–4414.DOI: https://doi.org/10.1016/j.rser.2012.04.028
 L.O. Ki et al., Bio-oil from Cassava peel: A potential renewable energy source, Bioresource Technology. 145 (2013) 157–161.DOI: https://doi.org/10.1016/j.biortech.2013.01.122
 G.W. Huber, J.A. Dumesic, An overview of aqueous-phase catalytic processes for production of hydrogen and alkanes in a biorefinery, Catalysis Today. 111(1–2) (2006) 119–132.DOI: https://doi.org/10.1016/j.cattod.2005.10.010
 R. Juneja, N. Abi, C. Ibaird, Review of biomass pyrolysis oil properties and upgrading research, Energy Conversion & Management. 48 (2011) 87–92.
 A.C. Mullen et al., Bio-oil and bio-char production from corn cobs and stover by fast pyrolysis, Biomass and Bioenergy. 34(1) (2010) 67–74.DOI: https://doi.org/10.1016/j.biombioe.2009.09.012
 Y.K. Park et al., Wild reed of Suncheon Bay: potential bio-energy source, Renewable Energy. 42 (2012) 168–172.DOI: https://doi.org/10.1016/j.renene.2011.08.025
 V. Volli, R.K. Singh, Production of bio-oil from de-oiled cakes by thermal pyrolysis, Fuel. 96 (2012) 579–585.DOI: https://doi.org/10.1016/j.fuel.2012.01.016
 D.C. Elliott, G.G. Neuenschwander, Liquid fuels by low-severity hydrotreating of biocrude, in: A.V. Bridgwater, D.G.B. Boocock (Eds.), Developments in Thermochemical Biomass Conversion, vol. 1, Blackie Academic & Professional, London, 1996, p.611–621.DOI: https://doi.org/10.1007/978-94-009-1559-6_48
 P. Duan, P.E. Savage, Upgrading of crude algal bio-oil in supercritical water, Bioresour. Technol. 102 (2011) 1899–(1906).DOI: https://doi.org/10.1016/j.biortech.2010.08.013
 X. Junming et al., Bio-oil upgrading by means of ethyl ester production in reactive distillation to remove water and to improve storage and fuel characteristics, Biomass Bioenergy. 32 (2008) 1056–1061.DOI: https://doi.org/10.1016/j.biombioe.2008.02.002