Alternative energy sources to coal, petroleum, and natural gas include biomass and biofuels generated from biomass.
Biomass is a low-carbon fuel or energy source made from plants like wood, corn, sugar cane, and grasses.
Biomass can be burned for energy and heat, digested for biomethane, and turned into liquid biofuels, biochemicals, and bioplastics.
Biomass includes wood and food crops such as sugarcane and corn, as well as agricultural waste such as corn straw (stover) and rice husks, and food waste such as vegetable oil recovered from cooking methods. Biomass is a renewable resource because it is largely made up of plants and flora that regrow on their own.
Hydropower and geothermal energy are two common examples of renewable energy sources.
Fossil fuels are continually created by natural processes, but because they take millions of years to develop and because known viable reserves are being used up much more quickly than new ones are being created, they are considered non-renewable resources.
The use of fossil fuels emits huge amounts of carbon dioxide into the atmosphere, in addition to pollutants like ozone, hydrocarbons, sulfur, mercury, smoke, and ash.
Since biomass is a renewable energy resource and low carbon fuel, they are not a fossil fuel.