you're really stupid bestbet.
your comment with 'petrol will inevitably run out', yeah ofcourse it will, just like the sun will eventually burn out. its not like we're in short supply of oil, the high prices are because of oil mainly being in arab country, and not so much in uk country.
and your comment "owuldn't you think the major companies that provide OIL will also provide this new source of energy? because they are multi-billion doller companies".
thats like saying "wouldn't you think bill gates would invent a cure for cancer coz hes a multi-billion doller company?"
no. oil companies specialise in selling oil, not inventing new energy sources.
and cold fusion isn't a theory. lol.