A hydrogen engine is a special engine that works similarly to the gasoline engine we usually use, except that it uses hydrogen as fuel to. This engine burns hydrogen to convert the chemical energy of hydrogen into mechanical energy, thereby generating power.
Unlike traditional gasoline or diesel engines that emit greenhouse gases such as carbon dioxide, the main emission of hydrogen engines is actually water. This greatly reduces pollution to the environment and makes it a cleaner energy source. This means that if our vehicles and power generation all use hydrogen engines, it will be a huge step forward in reducing air pollution and combating climate change.