Well, then you just have to invent a fusion reactor that:<p>- does not work by creating heat but by creating electricity directly (I am sure fusion creates plenty of high energy charged particles to make some electricity), and<p>- does not require any isotopes but fuses ordinary and plentiful atoms, such as ordinary hydrogen.<p>Well you are the scientist, get to it. After there are many alternatives but we all know their limitations. Regarding fusion, we know there is a potential for incredible amounts of energy that do not suffer most of the limitations of the other methods.