What are two fuels that are not obtained from petroleum?

Modern humans use several types of fuel that are not derived from petroleum. By “modern” I am referring to humans who are alive now. read more

U233 comes from U238 and U233 comes from thorium but I prefer not to call those fuels. Wood and other biomatter - bypass the millions of years underground business. So nuclear and biomatter. read more

Similar to tires, this fuel is taking existing petroleum in order to make an alternative fuel. It is also still in the testing phase, and there are debates about whether this fuel can maintain power output. 5. Coffee grounds. Coffee grounds have a valuable disposal use outside of the compost pile. They can be turned into biodiesel. read more