We should always conserve fuels and it is our duty. We use fuel that is fossil fuels for running machines , automobiles etc. Actually fossil fuels are obtained from the organic and decomposed matter or living organisms. Now fossil fuels are slowly disintegrating and it is really hard to obtain such fuels and takes millions and millions of years to form! 
           We could conserve it by using other sources of energy for machines such as solar energy; which has become very popular. Eg: a place using solar energy is the Cochin International Airport,India
India has taken steps to clean and protect the country. The Swachh Bharat Mission is a mission to clean dirty river, replace fuels with other sources of energy. SO WE GIVE INDIA SALUTE FOR SUCH AN EFFORT!!