The world is focusing on the impending energy crisis and each country needs to concentrate on energy security as well as growing pollution and environmental concerns. Due to the increasing demand fossil fuel reserves are depleting rapidly. Also due to the rapid rise in petroleum prices and uncertainty in their supply, it has become necessary to search for other alternatives fuels. The biodiesel can be considered as alternative to fossil fuels. In this review the focus is to identify the

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... nce and emission of various biodiesels along with cottonseed and thumba biodiesel.