We have become used to a world where hydrocarbons are the energy source, certainly for portable energy. Historically it has not been the case that there is one

We have become used to a world where hydrocarbons are the energy source, certainly for portable energy. Historically it has not been the case that there is one predominant source of energy. I think that we will go back to that state of affairs. So, yes, hydrogen powered fuel cells are likely to be a major source of power in the next 10 years. It is just that there will be other major sources of power as well. Different energy storage systems have different attributes and are viable in different applications.