Lecture 9 Alternative Energy: BiofuelsPowerPoint PresentationBiomass FuelsSlide 4BiofuelsSlide 6Slide 7DisadvantagesSlide 9Cellulosic ethanol (Cellulose)Algae biofuel videoSlide 12Biofuel AdvantagesBiofuel DisadvantagesLecture 9Alternative Energy: BiofuelsECOL 1000: Ecological Basis of Environmental IssuesUniversity of GeorgiaSpring 2015Biomass FuelsBioenergy: energy contained in firewood and other plant matterDerived from solar energyTraditional fuels- wood, charcoal & animal dungFossil fuel takes carbon out of coal, oil, and natural gas deposits. Fossil fuel takes carbon out of coal, oil, and natural gas deposits.BiofuelsBiofuelsBiofuelsBiofuelsCO2CO2 CO2 used to make ethanol from trees comes from the air, not out of the ground. Therefore, when it is burned, it does not increase the net amount of CO2 in the air CO2 used to make ethanol from trees comes from the air, not out of the ground. Therefore, when it is burned, it does not increase the net amount of CO2 in the air Where does the CO2 come from? Where does the CO2 come from?Source: US Department of EnergyDisadvantagesEthical concerns?NBC: Kudzu video NBC: Kudzu videoCellulosic ethanol (Cellulose)+•Switchgrass•Native•Needs little fertilizer or water•Grows on marginal land•perennial-•Not produced large-scale•No subsidy available•Enzymes expensiveAlgae biofuel videoExperimental NASA OMEGA bagsBiofuel Advantages•Carbon neutral•Lower NOx and SOx•Abundant•Widely distributed•Produced domesticallyBiofuel Disadvantages•Is it really carbon neutral?•Costs associated with transport, processing, fertilizers, water, etc…•Net