As the world faces the urgent need to address climate change, several countries are taking action by transitioning to energy technologies that do not produce carbon emissions. Along with the adoption of solar and wind power, there is growing interest in utilising promising hydrogen technologies.

The concept of a "hydrogen economy" envisions the utilisation of hydrogen as a sustainable, low-emission energy source to fulfil global energy requirements. This would involve replacing conventional fossil fuels in diverse applications and establishing hydrogen as a significant component of a clean energy mix.

Although hydrogen is the most abundant element in the universe, it is rarely found in its pure form on Earth. Instead, it usually occurs in hydrocarbon-like compounds such as water (H2O) and methane (CH4). To obtain pure hydrogen, it must be separated from these compounds, a process often requiring energy and producing carbon emissions.

Despite this, hydrogen has several key advantages that make it an attractive option for decarbonization. When it is burned or reacted with oxygen, the only byproduct is water vapor, making it a completely clean source of energy. Additionally, hydrogen can be produced from a variety of sources, including renewable sources like solar and wind power.

Hydrogen can be produced basically in three ways: natural gas (steam reforming of methane), coal (coal gasification) and water using electrolysis. The greenest method is electrolysis, which uses electricity to split water into its components-hydrogen and oxygen. This power comes from renewable sources, making the process completely carbon-free.

Hydrogen has many applications, from transportation to energy storage and industrial processes. In transportation, it can be used to power fuel cell vehicles, which only emits steam and has a longer operating range than battery powered vehicles.

In energy storage, it can be used to store excess energy from renewable sources such as solar and wind, which can then be used to generate electricity. In industrial processes, it can be used as a raw material for chemical reactions such as in the production of fertilisers.

Hydrogen has the potential to revolutionise the way we produce and use energy, reducing our dependence on fossil fuels and helping to mitigate climate change. It could also provide energy security, as it can be produced domestically from a variety of sources. Finally, it could help to create new jobs and industries in the hydrogen sector, providing an economic boost for countries that invest in the technology.

Hydrogen has the potential to be a game-changer in the quest to decarbonize the economy and combat climate change. While there are still challenges to be overcome, the benefits of hydrogen make it a promising option for the future. As we continue to develop and improve technology, hydrogen could become an increasingly important part of our energy mix, changing the course of time towards a cleaner, more sustainable future.