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"These homes represented the creation of immense wealth at the turn of the century in the United States, the kind of wealth acquired through fundamental commodities like water, gold, oil and food, " said Katherine Malone-France, the National Trust for Historic Preservation's historic sites director of outreach, education and support.
CNN: 'Downton' in America: 6 big estates
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Critics say Chavez used the state oil company like a piggy bank for pet government project funding homes, healthcare and food while neglecting oil infrastructure and production.
CNN: Chavez leaves Venezuelan economy more equal, less stable
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It has long been known that vitamin D prevents rickets and children were once given food supplements like cod liver oil.
BBC: Experts review vitamin D advice
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Like it or not, oil and gas will be the food that feeds the world for years to come, and demand for it will only rise when economies really recover.
FORBES: Connect
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Though some say the fuel smells like fast food, the cooking oil is safe for powering jumbo jets and provides exactly the same flying experience.
BBC: Cooking oil powers transatlantic flights
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Fuel it with 85 percent ethanol made from woody, weedy stuff like switchgrass, and you'll save three-fourths of the remaining oil without interfering with food production.
CNN: Freeing America from its addiction to oil
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"Biofuels, like palm oil, produce more carbon emissions than they save, fuel land grabs and increase global food prices, " she said.
BBC: Biofuels: MPs agree subsidies for power stations
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For all the hope and hype surrounding algae-based biofuels, producers like Solazyme are finding perhaps more success in selling their low-carbon oil for use in cosmetics, lubricants and food.
FORBES: Solazyme Taps Asia Market In Algae Oil Deal With Japanese Conglomerate