Hydrogen vs. Battery Electric Cars

...I really think that basic mechanical energy, can be converted into an unlimited electrical energy source,  through simple leverage....There probably are other motives for making other electrical generation industries...I do wonder about the radiation effects of millions of possible vehicles, with battery and or electrical generation machinery, in a small area....Maybe its not a problem; and maybe they can solve it, if it is....However, cities that use electricity for almost everything, with possible vehicles as well in the future, may have to address any concerns about this......