Hmmmm converting energy to kinetic and compress the air to convert it back to kinetic energy...... This does not seem to me so right. But history will tell...
Hybrids are a nice solution but the case with their batteries is still not an ideal solution.
Hydrogen cells seems to be an ideal solution bit what will happen if all cars emit water vapors in a city? Is this a realistic scenario?
Biofuels are many-promising but i prefer bread instead of fuel for my Yamaha
We should manage to use solar energy or wind energy or cosmic energy and things like that because the only solution seems to be bicycle
