The thing is, Global warming is happening. It's part of a natural cycle, In times gone by, the north pole was a veritable rain forrest. It then got colder and colder, until it was an ice age. It then got warmer and warmer (and it's still going). There is more Carbon Dioxide produced in a single Volcanic erruption, than Mankind has emmitted in his entire existance as a species.
Even if we could get every nation of the world to abandon Fosil fuels, it would only be a drip in the ocean. We'd also have to kill off all the termites of the world, plug every volcano, coat the entire white cliffs of dover with PVA, and we'd still only be scratching the surface.
Instead of investing fortunes in fuel efficiency, we should be spending it adapting to the new climate. The warmer world is coming, and what are we doing to prepare for it?
Once the cholcolate starts melting on your digestives, it's time to invest in alternative dunking material. Don't pontificate about the last four, just find a supplier of bourbons NOW. If we spend too long working out how to make our digestives go further, the shops will be closed, and we'll have no milk for our cereal in the morning.