Diesel can also be made from recently dead organisms, and this fuel is known as biodiesel.

But diesel fuel can also be derived from more recently-dead organisms,like plants and animals.And this type of fuel is what we call biodiesel.Biodiesel is a biodegradable energy source,made from plant oils or animal fats,that can usually be burned in regular diesel engines.You guessed it,it's the 'bio' version of diesel.It's cleaner than normal diesel,so there has been a push to generate it from crops like soybeans.Now, growing plants for fuel,instead of food, comes with its own problems.