The article reviews the literature on biohydrogen production, focusing on thermochemical processes such as pyrolysis and gasification. These processes are identified as effective and practical methods for producing hydrogen from biomass, with a particular emphasis on the use of catalysts, solid residues, and residual water. The authors discuss the potential of various terrestrial and marine biomasses, including agroforestry and lignocellulosic materials, for generating green hydrogen. They highlight the advantages of using renewable sources of hydrogen, such as low carbon dioxide emissions and the potential to reduce dependence on fossil fuels. The article also explores the role of catalysts in optimizing hydrogen production, the impact of reactor design on reaction kinetics, and the benefits of using residual water and solid residues in pyrolysis. Additionally, it examines the efficiency of gasification processes and the potential of marine biomass, particularly algae, for hydrogen production. The study concludes by analyzing the overall benefits of hydrogen as an energy option, emphasizing its potential to contribute to the transition from fossil fuels.The article reviews the literature on biohydrogen production, focusing on thermochemical processes such as pyrolysis and gasification. These processes are identified as effective and practical methods for producing hydrogen from biomass, with a particular emphasis on the use of catalysts, solid residues, and residual water. The authors discuss the potential of various terrestrial and marine biomasses, including agroforestry and lignocellulosic materials, for generating green hydrogen. They highlight the advantages of using renewable sources of hydrogen, such as low carbon dioxide emissions and the potential to reduce dependence on fossil fuels. The article also explores the role of catalysts in optimizing hydrogen production, the impact of reactor design on reaction kinetics, and the benefits of using residual water and solid residues in pyrolysis. Additionally, it examines the efficiency of gasification processes and the potential of marine biomass, particularly algae, for hydrogen production. The study concludes by analyzing the overall benefits of hydrogen as an energy option, emphasizing its potential to contribute to the transition from fossil fuels.