Citrus peels can also be used to make activated carbon. Worldwide, the citrus juice industry generates 15 million tonnes of wasted peels, pulp and seeds every year.

Here are some ways to prevent and clean carbon buildup in your engine. No matter what injection system your car has, it's subject to carbon buildup over time.

Air Company, a startup that has used water and carbon dioxide to make vodka and to power automobiles, taste-tests its product and discusses getting Elon Musk’s business, Adam Iscoe writes.

Citrus peels can also be used to make activated carbon. Worldwide, the citrus juice industry generates 15 million tonnes of wasted peels, pulp and seeds every year.