What are the advantages in using hydrogen as a fuel?

Hydrogen as a fuel has the following advantages (i) It has high calorific value.
(ii) During combustion, it does not produce smoke or any unpleasant fumes.
(iii) It leaves no ash after burning. The only product of combustion is water.
(iv) It does not pollute the air because no pollutant is produced during its combustion.
(v) It can be used in a fuel cell to generate electricity.
(iv) It can be used in the internal combustion engines with slight modifications.