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Biomass can be used to produce energy, which is called biopower (Renewable Energy 2008). Biopower is powered by two types of biofuels, which are ethanol and biodiesel (Biofuels Basics). Ethanol is fermented plants, such as corn, that is produced in a process "that is similar to making alcoholic liquors" (Renewable Energy 2008). Biodiesel, "a nontoxic, biodegradable liquid fuel", is produced from a mixture of gasoline and vegetable oil (Renewable Energy 2008). Biopower is made by burning waste wood and other sources, which then heats waters that then turns into steam, which then turns a turbine (Alternative Sources of Energy). There are many drawbacks to biopower; to produce the biomass a large amount of land and materials is needed (Renewable Energy 2008). Biopower does release carbon dioxide, but the plants that are used in biomass use the carbon dioxide given off (Ibid). The burning of biodiesel might also increase the emissions of a greenhouse gas called Nitrous Oxide (Ibid). The future for biopower is that bigger countries will use it for heating and cooking instead of energy production (Ibid).
Compressed air car has "two hearts pumping" or "separate motors running at different times," these motors do this so that they run more efficiently (CNN). The compressed air turns the pistons, which then turns the wheels on the vehicle (Ibid). The only emission that comes with compressed air tank is cold air (Car Runs on Compressed Air). The tank that holds the compressed air can be trashed or recycled with little toxic waste (Environmental Research Letters). According to CNN, the compressed air tanks would reduce the cost of making cars by at least twenty percent. The cost would reduce because the cars will not need cooling systems, fuel tanks, and spark plugs (CNN). A prototype for a car with this new technology was sold for nearly ten thousand dollars (Car Runs on Compressed Air).
One of the 6 most widely used types of fuel cells is Phosphoric (Fuel Cells Explained). According to NASA, the different types depend on the different way that the hydrogen and oxygen combine to make water.
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"Biomass, Compressed Air Tanks, and Fuel Cells." 123HelpMe.com. 22 Feb 2020
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Even though Biomass and Compressed Air are both renewable energy sources; Fuel Cells are the best. Fuels Cells are the best because the emissions it gives out. Fuel Cells also very efficient because water will be here for a long time, so people will always be able to get both hydrogen and oxygen. Fuel Cells also go in a continuos cycle; hydrogen and oxygen come together too produce water and energy then the water can be turned into hydrogen and water again. Fuel Cells are efficient because of this cycle. All this information makes Fuel Cells be the best alternative energy source.