OPEC says there's plenty of oil.

[Iphido]

LPG will be around for many years. Australia is one of the very few countries that widely sells LPG, mostly its wasted or burnt during refining. The is plenty of LPG in the short term.

Australia also has plenty of Natural gas reserves. Between LPG and Natural gas, there is enough fuel to keep australia running for the next 100 years. When Petrol does become extremely expensive, LPG will be the big interim solution. All local and most overseas manufacturers could convert to a LPG range of vechicals almost over night and certainly within a single model cycle. CNG is much the same although the size of the tank makes packaging it in existing models more difficult.

Hydrogen is not a good short or long term solution. Fuel cells might eventually replace things like Generators and Solar cells, but not for vechicals.

Other than CNG and LPG, there are also options like coal dust, gasification of biological materials etc. Which are basically limitless. And high ratio ethanol fuels as well.

Have you noticed CNG buses in Sydney or the large number of LPG Police vechicals?