@GoddersUK: Well indeed, but once you've shifted the problem from millions of individual cars to just the power stations it's closer to being solved. Especially if we can push for cleaner and greener forms of electricity production at the same time. It's easier and more practical for governments to tax and legislate against unclean power production than individuals vehicle usage.
There is no single solution that will fit all scenarios, the use of existing waste to produce biofuels will suit some situations, electric vehicles others and some situations will doubtless still rely on petrol (I can't see those Alaskan ice road trucks getting by on batteries in the near future!) The future will doubtless require a multitude of solutions, unless something utterly revolutionary comes along.