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By limiting the speed limit of its trucks to a maximum 60 miles per hour, the company estimates that it can save 3.75 million gallons of diesel fuel and cut carbon dioxide waste by 83 million pounds per year.
FORBES: Magazine Article
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Add to this the cost of diesel fuel, the extra carbon emissions and the further strain the trucks would place on the nation's highways and the outlook for clean, supposedly green ethanol looks dimmer and dimmer.
FORBES: Ethanol: Getting There Is None Of The Fun
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The worst offenders are palm oils, which may have ten times the carbon emissions of normal diesel fuel derived from petroleum if the palm is grown on converted rainforest land.
FORBES: Land Use Changes Are Main Factor In Carbon Emissions From Biofuels
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In road testing a hydraulic hybrid truck in suburban Detroit, Michigan, the EPA found the vehicle used 40 to 50 percent less fuel than conventional diesel trucks while reducing carbon emissions by one third.
CNN: EPA, UPS join to launch eco-friendly hybrid trucks
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Also, the cleaner burning fuel reduces combustion byproducts over petroleum and diesel, cutting carbon monoxide emissions by an estimated 90%-97%, and nitrogen dioxide emissions by 35%-60%.
FORBES: Tough Trucking For Natural Gas Vehicles: Can They Make It In The Long Haul?
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It acts like a giant spark plug, busting apart a tiny portion of the diesel fuel with an electric charge so that the molecules rearrange themselves into carbon monoxide and hydrogen.
FORBES: Clearing the Air
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When the bus's fuel processing system converts methanol to hydrogen, it also produces carbon dioxide, but at lower levels than diesel engines.
CNN: Bus showcases fuel cell technology