Biofuel is fuel made from organic material, normally plants in some form. Common biofuels are wood, ethanol and biogas. As the carbon in biofuels are part of the natural carbon cycle, the carbon dioxide emitted when biofuels are used doesn’t increase the greenhouse effect and global warming.
Biofuels can however be problematic if farmland or crops which are needed for food production are used for energy production instead. Improper production of biofuel can also result in substantial emissions of greenhouse gases like methane. Biofuel is a form of renewable energy.