Green Hydrogen: This technology is based on the generation of hydrogen — a universal, light and highly reactive fuel — through a chemical process known as electrolysis. This method uses an electrical current to separate the hydrogen from the oxygen in water. If this electricity is obtained from renewable sources we will, therefore, produce energy without emitting carbon dioxide into the atmosphere.
Described by the International Energy Agency as a “versatile energy carrier,” hydrogen has a diverse range of applications and can be deployed in sectors such as industry and transport. Examples of its use in the latter include trains, airplanes, cars and buses powered using hydrogen fuel-cells. Hydrogen can be produced in a number of ways. One method includes using electrolysis, with an electric current splitting water into oxygen and hydrogen. If the electricity used in the process comes from a renewable source such as wind or solar then it’s termed “green” or “renewable” hydrogen.
These days , the vast majority of hydrogen generation is based on fossil fuels, which in turn has an effect on the environment. The IEA has said that hydrogen production is responsible for roughly 830 million metric tons of carbon dioxide each year. “Blue hydrogen” on the other hand refers to hydrogen produced using fossil fuels — usually natural gas — with the associated emissions captured and stored.
Green hydrogen — however ,which is currently expensive to produce — accounted for just 0.1% of worldwide hydrogen production in 2020.
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