This is a BIG question
It is very dependant on the type of fuel we have available to power our transport.
If there is no oil - how would we power today's cars, buses, trains etc. Also current transport forms are not good for the planet producing CO2.
Much talk of alternative fuels - for example, using oil from plants - the problem with this is there is not enough food in the world to feed everyone so it is really not a good idea to use the food to power transport.
Hydrogen power - this gas makes up 80% of the air, + is in water - so lots of it. When used, the only exhaust is water vapour.
See http://en.wikipedia.org/wiki/Hydrogen_vehicle for more information.
Power from the sun, using the sun rays to create electricity in solar panels.
See http://en.wikipedia.org/wiki/Solar_vehicle
The target will be for transport to be designed to be lighter and faster and hopefully more fuel efficient.
Some good ideas are on:
http://library.thinkquest.org/04oct/01249/
There are a few games in this website as well.
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