Due to limited resources and hazardous effects on environment people now a day tries to find out an alternative for fossil fuels. Fossil fuels when burnt produce a lot of carbon dioxide which is one of the primary reasons for global warming. Petroleum is a form of fossil fuel. With the help of distillation process petrol, paraffin, kerosene and diesel oil can obtain from natural petroleum. To protect the environment biodiesels can substitute these fossil fuels. Biodiesels can use as an alternative for diesel. Researchers from around the world tried for many years to find a suitable biodiesel which can substitute diesel. Many biodiesels have been produced from different sources and tested for their performances. Some researchers try to find out a good combination of biodiesel blends which can be used as an alternative of diesel. Some of them try to find out a suitable blend of diesel and biodiesel to reduce the environmental impact and for better emission characteristics. Effects of blending different types of biodiesels with diesel have been investigated by many researchers. In this present review article a summary is written on such attempts.
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