think its all a bit ott, at the end of the day the only reason we're not using alturnative fuels in the mainstream is down to one reason, money. production of oil and petrol engines etc are cheap because the infrastructure is in place to mass produce them cheaply, due to it being in demand for so long.

fact, we have the technology to build "green" engines but its not cost effective for industries to mass produce them due to the massive demand on oil dependant goods (bigger profits to be made).

if they was to say tomorrow "right, no more oil its all gone" it would be in the best interest of the TRILLION £££ industires that create what we all use everyday, to switch to producing a product that uses a alternative source of energy,putting into place the infrastructure to build these "green" engines cheaply. as long as that pressures not there,their not going to lose billions and billions in switching over because lets face it, in business, since when did the greater good be anywhere near relevant priority.

yes theyre would be a HUGE economic change in the world but you've only got to look at how the world changed from steam to petrol power to see that it is possible for the world to switch to a better more economical source of fuel.