Not only do alternative fuels burn cleaner to reduce emissions, but some are also renewable, unlike fossil fuels, which means that we could develop a continuous supply of them. Alternative fuels in use today include ethanol, biodiesel, methanol, natural gas, propane, electricity and hydrogen.
Biofuels are renewable, because they are produced from biomass-organic materials such as plants. What they generate roughly the same amount of carbon dioxide (a greenhouse gas) from the exhaust, such as fossil fuels, but the plants are grown for the production of biofuels, actually, the elimination of carbon dioxide emissions of. Hence, the net emission of carbon dioxide will be close to zero.