After the general realization of the degenerating environment, efforts are being made to "go green" with respect to everything - be it energy sources, renewable resources or resource conservation.
However, this blog is regarding the cars "going green".
When it was realized that the traditional fuels used to power the cars were sources of obnoxious pollution hazardous not only for the direct inhalers but also for the ozone, immediate efforts came into being to switch over to "less-polluting" alternatives so that the environment can be saved.
The basic idea behind the selection of fuel for vehicles is it should readily react with air, more specifically oxygen. Selection by this rule allows for reduction in costs of fuels.
These attempts are depicted in the conversion of petroleum-run cars into CNG-run cars here in Pakistan, though the reasons here were not remotely the conservation of the environment but rather the conservation of people's finances. However, for whatever reasons, progress was made.
More recently, a more "greener" fuel has been discovered in the form of compressed hydrogen gas. The exhaust products of this fuel is WATER - hence it is by far the greenest fuel. Attempts are being made to commercialize this fuel, but the precautions for this fuel makes it too dangerous for domestic use. Compressed hydrogen gas is highly flammable; minor accidents can also cause severe damages.
I believe hydrogen gas will be a viable fuel source if the cars are made of rubber which will repel on collision, instead of collapse. Water as a by-product makes hydrogen exceptionally green - if only more research is done regarding how to make this fuel domestically usable, I believe the ultimate "green" will be achieved in this regard.
Peace.
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