Fuel cells were invented in the 19th century, but their practical application has been extremely limited to date, as thermal power generation has become the mainstream method of power generation. Today, with decarbonization and the hydrogen economy, fuel cells are again attracting attention as a method of power generation using hydrogen. Innovations are necessary for fuel cells to become more practical than they are today, not only in the fuel cells themselves but also in the way of storing and transporting their fuel, as well as in the method of producing it.
Oil and coal, which have brought about modern industry, are limited resources and destined to be exhausted someday. Moreover, combustion of oil or coal causes various kind of pollution. That's why the advanced nations are groping for the clean alternative energy sources since the oil crisis. There are many candidates for it, such as nuclear power, photovoltaic power, wind power, waterpower generation, but it is my considered opinion that methane is the best alternative energy sources. I'll tell you the reason for it.