Alternative fuels are any materials or substances that can be used as a fuel, other than traditional fossil fuels, such as coal, oil and natural gas. Promoting the use of alternative fuels is often seen as a way to reduce greenhouse gas emissions and reliance on fossil fuels. Common alternative fuels include biofuels, hydrogen and electricity.
Some of the emerging trends in alternative fuels include the use of biodiesel, hydrogen fuel cells, and electric vehicles.