How to use the fuel effectively?

hello people,

here in the world there is a scarcity of all the fuels like petrol ,diesel , gas etc.,
So i would like to know what we all Engineers should do such that fuel is saved for the future generations too..!!

so tell here your ideas on it.

To implement new fuel generation techniques?

To start using bicycle instead of bike car etc.,?

To switch on to Solar ? however is it effective is the former ones?

So say your crazy ideas here ..

Mods : if we have a thread already with the same topic please merge it .


Cheers!!