What source of energy to replace oil/gasolin/petrol?

Nowadays,people in whole earth panic and confius because of what have happen to the economic of whole country.Early of this month, stock market of all the world have been dropped out until some of them make a history the lowest price of stock market ever come.And the main reason is oil or more specific is increasing of oil price.Leaders of oil supplier n OPEC are busy thiniking of how to make the price decreased and make it stable.But some of the country now thinking to replace the main energy.SO WHAT DO YOU ALL THINK,WHAT SOURCE SHOULD REPLACE THE OIL?