We should conserve fuel as we are exploiting it so rapidly that it's speed of renewability cannot keep pace with it's usage and demand. We know that fuel on earth is limited. If we continue to use it at the rate we do now, it won't last long. It take millions of years for its formation. Specially fuels like petroleum and coal.
We can save it by-
- using a bicycle or simply walking short distances
- turning the vehicle off at traffic lights
- using public transport
- use ac's less
- We should use alternatives like CNG and LPG or even solar energy.