Fracking is a method of extracting natural gas and oil from underground, and does not produce hydrogen.

Hydrogen's chemical formula is H2, indicating that it consists of two hydrogen atoms.

Hydrogen energy is not commonly used for cooking food, as it is typically more expensive and less convenient than traditional cooking methods.

Hydrogen has a low energy density, meaning that it takes up a lot of space to store a given amount of energy.

PEMFCs, SOFCs, and AFCs are all types of fuel cells that use hydrogen as a fuel.

Hydrogen fuel cells offer zero emissions, higher efficiency, and lower noise compared to internal combustion engines.

Japan is currently leading the world in the development and adoption of hydrogen energy technologies.

The FCH2 Train is the world's first commercial hydrogen-powered passenger train.

Hydrogen is currently more expensive than traditional energy sources, so its use as an energy carrier may not lead to lower energy costs.

Electrolysis is the process by which hydrogen is produced from water using electricity.

Hydrogen is abundant in the universe, so its availability is not a challenge associated with the development of a hydrogen economy.

Steam reforming is the process by which hydrogen is produced from fossil fuels.

Increased biodiversity is not a direct environmental benefit of using hydrogen as an energy carrier.

Gasification is the process by which hydrogen is produced from biomass.

Increased energy costs are not a potential economic benefit of using hydrogen as an energy carrier.