There are several ways to reduce greenhouse gas emissions from transportation sources, such as cars and airplanes, through the use of alternative fuels and technologies. Some of these methods include:1. Electric vehicles EVs : Electric vehicles are powered by electricity, which can be generated from renewable sources like solar, wind, or hydroelectric power. By replacing traditional internal combustion engine vehicles with EVs, we can significantly reduce greenhouse gas emissions from transportation.2. Hydrogen fuel cell vehicles: Hydrogen fuel cell vehicles use hydrogen gas as a fuel source, which produces only water vapor as a byproduct when combined with oxygen in a fuel cell. This technology can help reduce greenhouse gas emissions from transportation, especially if the hydrogen is produced from renewable energy sources.3. Biofuels: Biofuels, such as ethanol and biodiesel, are produced from renewable organic materials like plants or algae. These fuels can be used in place of gasoline or diesel in vehicles, reducing greenhouse gas emissions. However, it is essential to ensure that the production of biofuels does not lead to deforestation or other negative environmental impacts.4. Improved fuel efficiency: Developing and implementing more fuel-efficient engines and vehicle designs can help reduce greenhouse gas emissions from transportation. This can be achieved through advancements in engine technology, lightweight materials, and aerodynamics.5. Hybrid vehicles: Hybrid vehicles use a combination of an internal combustion engine and an electric motor to improve fuel efficiency and reduce emissions. By using both technologies, hybrid vehicles can achieve better fuel economy than traditional vehicles.6. Sustainable aviation fuels SAFs : SAFs are produced from renewable sources, such as waste oils, agricultural residues, or algae. These fuels can be used in place of conventional jet fuel in airplanes, reducing greenhouse gas emissions from air travel.7. Public transportation and carpooling: Encouraging the use of public transportation, such as buses and trains, can help reduce the number of individual vehicles on the road, leading to lower greenhouse gas emissions. Additionally, carpooling can also help reduce the number of cars on the road and decrease emissions.8. Active transportation: Promoting walking, cycling, and other forms of active transportation can help reduce greenhouse gas emissions by decreasing the reliance on motorized vehicles.By implementing these alternative fuels and technologies, we can work towards reducing greenhouse gas emissions from transportation sources and mitigating the impact of global warming.