Suggest some ways to conserve coal and petroleum

Explanation

(i) Coal and petroleum should be used as judiciously as possible. In order to protect the overuse of petrol, car pool may be encouraged or wherever possible the use of personal vehicles should be avoided.
(ii) Alternative sources of energy should be put to use.
(iii) Vehicles and engines must be tuned and maintained well to make them fuel efficient.
(iv) Wastage of energy like electricity, cooking gas, etc. should be checked.