Synthetic fuels are one just one alternative to oil. Some synfuels are better for the environment, some are worse. Some are made from rocks found deep under the earth, and some are made from the trash in your local landfill. See what you know about the various types of synfuels in our ultimate synthetic fuels quiz.
Used mainly in the U.S. as pancake syrup, sweet sorghum is exploding in popularity thanks to its other uses as a biofuel and animal feed. How can one plant do so much?