the best possible energy source, the sun, with improved solar panels, and new methods of storage, the sun's energy would last as long as earth and not cause any pollution.
with all our scientific advances, including all our new toys, ie: a little thing that holds all your music and fits in your pocket, a phone that takes pictures and sends them through the air waves (i don't understand this, but i never understood the need to have a phone in your ear while you are walking or trying to park your car), lcd's, cd's and all the other d's i haven't even read about yet, wouldn't you think some effort to develop and improve solar energy should be some where in the mix?
only one problem, the big corporations have not figured out how to put a meter on the sun so they could charge you.