Different+world+energy+sources

1. **Primary Energy** -Predominantly in the form of fossil fuels. -Industrial production, financial and other services, agriculture, and transport require adequate supply of this energy. -Source such as coal, crude oil, or gas is fuel in its initial form. -When these fuels are burnt in air (oxygen) they produce carbon dioxide, water and varying amounts of energy. -Due to the abundance of carbon dioxide in the air from the carbon cycle, disposal of carbon dioxide was believed to be harmless. -These primary energy source of world energy has directly or indirectly had its origin due to the radiant energy from the Sun

2. **Secondary Energy** -Usually in the form of electricity and consumable fuels. -Sources such as electricity and petrol are produced from primary sources 