We are using limited natural resources too much like coal and petroleum. If possible we can also switch to e-cars ( electronic cars). Coal takes several years to form again and petroleum too. Petroleum is now getting to be over. We also have to save coal and petroleum for the next generation. To save it we should reduce waste,and switching to renewable alternatives. To save petroleum we can also use public transports like buses. And to save coal we can turn off electronic devices like fans.