SAO PAULO – A Brazilian team of engineers has developed a process of using defective coffee beans as a source for biodiesel. Biodiesel is a clean-burning fuel derived from any fat or vegetable oil that works in any diesel engine. It can be used as an additive to diesel in the same way ethanol is mixed with gasoline. Brazil is the world's largest coffee producer. About 20% of its overall crop is deemed defective and not fit for human consumption, but these beans sometimes become available ...

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