Green hydrogen is produced through a process called electrolysis, which uses electricity to split water into hydrogen and oxygen. The process of electrolysis involves passing an electric current through water, which separates the hydrogen and oxygen atoms in the water molecules. The hydrogen produced through this process is referred to as green hydrogen because the electricity used to produce it is generated from renewable energy sources, such as solar, wind, or hydropower. The production of green hydrogen requires the following steps: Renewable energy generation: Renewable energy sources are used to generate electricity, which will be used in the electrolysis process. Electrolysis: The generated electricity is then used to split water into hydrogen and oxygen through electrolysis. This is done using a device called an electrolyzer, which consists of two electrodes (positive and negative) and a membrane that separates the hydrogen and oxygen. Separation of hydrogen and oxygen: The hydrogen produced in the electrolysis process is separated from the oxygen and stored in a tank. The oxygen is released into the atmosphere. Purification of hydrogen: The hydrogen produced through electrolysis may contain impurities, such as carbon dioxide or water vapor. To ensure its purity, the hydrogen is often subjected to a purification process, such as pressure swing adsorption or molecular sieve technology. The overall process of green hydrogen production is clean, safe, and sustainable, as it produces no greenhouse gas emissions or harmful pollutants. This makes it a promising solution for reducing greenhouse gas emissions and addressing climate change. Also, Grey hydrogen is a type of hydrogen that is produced from fossil fuels, such as natural gas or coal. The process of producing grey hydrogen releases significant amounts of greenhouse gas emissions, including carbon dioxide (CO2). This makes grey hydrogen a significant contributor to climate change, as the production and use of fossil fuels are known to release large amounts of carbon dioxide into the atmosphere. However, Grey hydrogen is the most widely produced and used type of hydrogen, accounting for the majority of global hydrogen production. Despite its negative environmental impact, grey hydrogen remains popular due to its relatively low cost compared to alternative forms of hydrogen, such as green hydrogen.