3. The energy that we get from Biofuels originally came from the sun. This solar energy was captured through photosynthesis by the plants used as feedstocks (raw materials) for biofuel production, and stored in the plants' cells. Many different plant materials can be used for biofuel: Sugar crops (such as sugar cane or sugar beet), or starch (like corn or maize) can be fermented to produce ethanol, a liquid fuel commonly used for transportation. Natural oils from plants like oil palm, soybean, or algae can be burned directly in a diesel engine or a furnace, or blended with petroleum, to produce fuels such as biodiesel. Wood and its byproducts can be converted into liquid Biofuels, such as methanol or ethanol, or into woodgas. Wood can also be burned as solid fuel, like the familiar firewood. Chipped waste biomass, such as the tops of trees discarded by logging operations, can be burned in specially designed furnaces. Researchers are working to improve biofuel production processes. Before bioenergy can make a larger contribution to the energy economy, feedstocks, agricultural practices, and technologies that are efficient in their use of land, water and fossil fuel must be developed

4. May reduce U.S. reliance on oil imports and enable moderate reduction in emissions of greenhouse gases compared with oil. Fosters the building of Biofuels infrastructure. Made from vegetable oils like soy and canola and animal fat, biodiesel provides 90% more energy than is required to produce it. Compared with petroleum-based diesel fuel, biodiesel is estimated to cut greenhouse-gas emissions 40% to 80%. Sugar cane yields more ethanol per acre than corn, and it requires less energy to produce; hence, it is regarded as greener than corn ethanol. Sugar isn't a food staple, so making ethanol from it hasn't driven up food prices as has the production of large amounts of corn ethanol. Brazil makes nearly as much ethanol from sugar cane as the U.S. does from corn; cane provides nearly half of Brazil's transportation fuel from plants grown using about 1% of its arable land. Made by breaking down wood chips, farm waste, and nonfood crops like grasses, cellulosic ethanol wouldn't require diverting the use of cropland Scientists are making progress at breaking down plants' tough cellulose and lignin molecules, the key to turning nonfood biomass into fuel The fastest-growing plants, algae theoretically can produce 30 times more energy per acre than other biofuel options. A particularly rich mix of byproducts can be made in algal-Biofuels operations (everything from nutraceuticals to feedstocks for making plastics), potentially abetting their cost-effectiveness. This is the Biofuels' dark horse.

5. Ethanol is energy intensive to produce, and the recent boom has pushed corn prices to more than $5 a bushel (from $2 in 2006). That is increasing the cost of everything from beef to soft drinks. The Biofuels craze is helping drive up grain prices worldwide as farmers devote more acres to corn and less to other crops. Over 450 pounds of corn are needed to fill a 25-gallon tank with ethanol_ enough calories to feed a person for a year. Like corn ethanol, biodiesel's production from food crops boosts "agflation.“ European demand has been blamed for inducing farmers in Southeast Asia to burn and replant the rain forest with palm plantations, which has released large amounts of greenhouse gases. Production is limited at the moment_ just 250 million gallons in 2006 Growing sugar cane requires a warm, rainy climate, which limits its potential as a global fuel source. Still costly and difficult to make, ethanol produced from nonfood plants is more energy intensive than that made from corn and sugar cane. By one estimate, putting all the grassland in the U.S. into fuel production could replace only about 10% of petroleum. Unlike cellulosic ethanol, the biomass for making a lot of fuel from algae doesn't yet exist; it has to be grown from scratch. Harvesting is still expensive. Cost-effectively producing algal Biofuels on a large scale may be many years away.

8. Hydrogen is environmental friendly, does not pollute, hydrogen only release water vapor and heat as its byproducts Does not release CO2, which contribute to global warming. Hydrogen can quickly be refueled just like gasoline. Hydrogen is 100% renewable energy if hydrogen is obtained through electrolysis. Hydrogen is abundant and can be produce around the world. Recharging hydrogen fuel cells in cars cost less than filling up with gasoline. Hydrogen use in cars is 40%-60% more fuel efficient with electric motor than gasoline cars. Reduce our dependent on foreign oil.

9. Hydrogen is highly flammable and explosive. There are not enough hydrogen stations to refuel hydrogen cars Hydrogen cars can only be lease by Honda. Expensive to use on cars as because hydrogen fuel cell batteries are expensive. It is expensive to transport, store and produce hydrogen power. It takes more energy to produce hydrogen than producing it. Cars run on hydrogen fuel cell do not travel farther than cars running on regular gasoline. Hydrogen fuel use in cars use water to function, living in cold climate will freeze the water causing problem.

10. Biofuels www.google.com http://www.dec.ny.gov/e nergy/44157.html http://www.dec.ny.gov/e nergy/44157.html http://money.cnn.com/g alleries/2008/fortune/08 04/gallery.green_biofuel s.fortune/5.html http://money.cnn.com/g alleries/2008/fortune/08 04/gallery.green_biofuel s.fortune/5.html http://www.biofuelplane t.com/Biofuels/ http://www.biofuelplane t.com/Biofuels/ www.google.com http://www.facstaff.buck nell.edu/mvigeant/univ_ 270_03/john/hydrogen.h tm http://www.facstaff.buck nell.edu/mvigeant/univ_ 270_03/john/hydrogen.h tm http://www.keyframe5.c om/hydrogen-pros-and- cons/ http://www.keyframe5.c om/hydrogen-pros-and- cons/ hydrogen