This paper reviews the potential and roadmap for hydrogen energy as a key component of the clean energy landscape in Brazil, Austria, and Germany. The study aims to provide a comprehensive overview of the existing literature, highlighting key themes, trends, and research gaps in the scientific discourse regarding hydrogen production and energy policy. It focuses on the unique energy policies related to renewable energy in these three countries, which have distinct social systems and developmental stages. Brazil has significant renewable energy potential, particularly in wind and solar energy, positioning it for substantial growth. Germany has a regulatory framework that promotes innovation and technological expansion, reflecting its developed social system and commitment to transitioning away from fossil fuels. Austria is dedicated to decarbonization, particularly through the exploration of biomethane for residential heating and cooling. The paper discusses the role of hydrogen production in the global energy system, emphasizing its potential as a clean energy carrier. It reviews the global landscape of hydrogen production research, highlighting the leading contributions of countries such as China and the United States. The study also examines the different forms of hydrogen production, including green, gray, blue, brown, and white hydrogen, and their environmental impacts. The paper analyzes the decarbonization energy policies of Brazil, Austria, and Germany, highlighting their respective approaches to renewable energy and hydrogen integration. Brazil's policies focus on biofuels and renewable energy expansion, while Germany's policies emphasize renewable energy adoption and hydrogen infrastructure development. Austria's policies prioritize decarbonization through biomethane and renewable energy integration. The paper also explores sustainable pathways for the hydrogen sector in America and Europe, emphasizing the potential of renewable energy sources such as wind and solar for hydrogen production. It discusses the challenges and opportunities in hydrogen production between Brazil and Europe, highlighting the need for technological advancements, policy support, and infrastructure development to achieve a sustainable energy future. The study concludes that hydrogen has significant potential to play a pivotal role in achieving a sustainable energy future, particularly in the context of the global energy transition.This paper reviews the potential and roadmap for hydrogen energy as a key component of the clean energy landscape in Brazil, Austria, and Germany. The study aims to provide a comprehensive overview of the existing literature, highlighting key themes, trends, and research gaps in the scientific discourse regarding hydrogen production and energy policy. It focuses on the unique energy policies related to renewable energy in these three countries, which have distinct social systems and developmental stages. Brazil has significant renewable energy potential, particularly in wind and solar energy, positioning it for substantial growth. Germany has a regulatory framework that promotes innovation and technological expansion, reflecting its developed social system and commitment to transitioning away from fossil fuels. Austria is dedicated to decarbonization, particularly through the exploration of biomethane for residential heating and cooling. The paper discusses the role of hydrogen production in the global energy system, emphasizing its potential as a clean energy carrier. It reviews the global landscape of hydrogen production research, highlighting the leading contributions of countries such as China and the United States. The study also examines the different forms of hydrogen production, including green, gray, blue, brown, and white hydrogen, and their environmental impacts. The paper analyzes the decarbonization energy policies of Brazil, Austria, and Germany, highlighting their respective approaches to renewable energy and hydrogen integration. Brazil's policies focus on biofuels and renewable energy expansion, while Germany's policies emphasize renewable energy adoption and hydrogen infrastructure development. Austria's policies prioritize decarbonization through biomethane and renewable energy integration. The paper also explores sustainable pathways for the hydrogen sector in America and Europe, emphasizing the potential of renewable energy sources such as wind and solar for hydrogen production. It discusses the challenges and opportunities in hydrogen production between Brazil and Europe, highlighting the need for technological advancements, policy support, and infrastructure development to achieve a sustainable energy future. The study concludes that hydrogen has significant potential to play a pivotal role in achieving a sustainable energy future, particularly in the context of the global energy transition.