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Carmakers are looking to alternative fuels such as ethanol, natural gas and hydrogen to improve fuel economy, decrease greenhouse gas emissions and transition from foreign to domestically produced fuels. Scientists Question Environmental Impact of Corn Ethanol Growth January 28, 2009 REPORT Encouraged by government policies mandating ethanol use, Iowa has become the country's leading producer of corn ethanol. But now many scientists say that corn ethanol produces almost as many greenhouse gas emissions as gasoline, and they worry about the environmental effects of using so much land to grow corn. Climate scientist and Weather Channel correspondent Heidi Cullen reports for Climate Central and the NewsHour on the controversy over corn ethanol. How Does Your Car Stack Up? INTERACTIVE How do alternative fuels such as ethanol, hydrogen and biodiesel affect carbon emissions and your wallet? Find your car and compare its carbon dioxide output and fuel costs to the closest comparable alternative fuel vehicles. Corn Farmers Prosper, Others Lose Out with Ethanol Use REPORT As corn prices have risen with demand for ethanol in recent years, corn farmers are prospering. But others -- such as hog farmers who rely on corn feed -- are facing tough times, and some critics blame ethanol demand for rising food prices worldwide.	Main: Alternative Fuels   Ethanol: Questions Loom   Case Study:   The Switch to Unleaded Gas   Interactive: How Does   Your Car Stack Up?   Archive   Classroom Activity   Ethanol Worksheet Questions   Lesson Plan   Car Choices and Alternative Fuels Hydrogen Fuel Cells Interactive: Learn how a fuel cell converts hydrogen into energy to power a car. Car of the Future NOVA investigates a new breed of cleaner, more efficient vehicles.

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