The eastern states such as Victoria, New South Wales & Queensland are riddled with roads. It seems everybody wants to own a vehicle but how are we suppose to power these vehicles, through war it seems, but war is futile, obviously more fossil fuel oil pools need to be discovered, coal may need to be converted into oil. Their is gas like coal seam gas & natural gas but little has been done in regards to producing vehicles to run on gas. A reasonable amount of vehicles have been distributed to run on diesel & this tells us that this is because of international biofuel or biodiesel outlines. The proposal of growing biofuel crops such as oil palms in south asia, papua new guinea & northern australia & other places around the world was first put on the table in the 1930's by english & australian botanists. In the 1970's algae was found to be the the most efficient biofuel.
Alot of work has to be done before Biofuels will replace fossil fuels, Australia actually lags behind many other countries around the world in the field of biofuel cultivation. Reason being its going to take alot of work by alot of people to establish biofuel production.
Most efficient Biofuel crop yields, in order . . .
algae (open pond)
Will electric machinery & vehicles replace fuel powered vehicles ?
Possibly they could but this would involve investing in renewables like Geothermal, Hydroelectricity, Solar energy, Tidal power, Wave power & Wind power. Alot of machinery would have to be made to be electric instead of running on fuel. Possibly vehicles will run on roads that have a rail at the same level as the road, note the vehicle does not have to make contact with the rail for a tesla coil can transmit electricity without wires, this would do away with cumbersome batteries & a overhead electric grid.
 Biofuels ! Robotic machinery can cultivate biofuel crops, suck up carbon, produce oxygen, clean option . . .
 Conversion of rock into fuel, like coal & other rocks ! Thermal depolymerization) & other scientific methods, more research & development required.
 Conversion of ocean, atmosphere & rock into fuel ! Thermal depolymerization & other scientific methods, more research & development required.
 Electric propulsion ! Well we are getting their slowly.
Shall we agree that  &  be our current options.