A gas station with fuel prices in the $4 range in Los Angeles on April 11. With the price of gas above $3.50 a gallon in all but one state, there are signs that Americans are cutting back on driving, reversing a steady increase in demand for fuel as the economy improves. Reed Saxon/AP hide caption

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$4 A Gallon Gas Prices: Who's To Blame?
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Oil Firms Seek To Prove They Can Contain Spills
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The ShopGirls, from Granite Falls High School in Granite Falls, Wash., prepare their car for the annual Shell Eco-marathon on Saturday at the George R. Brown Convention Center in Houston. Jeff Brady/NPR hide caption

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Students Strive For Fuel Economy In Vehicle Contest
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Colorado School District Cuts Bus Service
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In this photo provided by passenger Brenda Reese, an unidentified passenger takes photos with a cell phone of a hole in the cabin on a Southwest Airlines aircraft. Brenda Reese/AP hide caption

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Cracks Found In Three More Southwest Jets
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In some parts of the country, like San Diego (above), gas prices are above $4 a gallon. Some Republicans are trying to tie those higher prices at the pump to President Obama's energy policies. Gregory Bull/AP hide caption

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Revving Up For 2012, GOP Hits Obama On Gas Prices
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Obama Energy Plan Would Reduce Oil Imports
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Huge tanks help house the oil surplus in Cushing, Okla. Each tank holds more than 250,000 barrels of oil. Jeff Brady/NPR hide caption

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Canadian Oil Bottleneck Means Cheaper Gas For Some
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Gift Basket King Files For Bankruptcy Protection
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Spent nuclear fuel rods are stored in pools of water at Japan's Fukushima Dai-ichi nuclear power plant. The water keeps the rods cool while protecting the environment from their radiation. Jiji Press/AFP/Getty Images hide caption

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Japan Crisis Sparks Nuclear Waste Questions In U.S.
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Will Rising Gas Prices Put Brakes On The Economy?
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In Colorado, yellow warning poles designate the underground path of a gas pipeline. Jeff Brady/NPR hide caption

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Policing America's Vast Gas Pipeline System
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Drivers in the middle of the country have gotten a break on gas prices because of bargain-priced oil coming in from Canada. Monika Wisniewska/iStockphoto.com hide caption

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Why Is Gas Cheaper In Midwest? Thank Canada
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A cargo ship transits the Suez Canal en route from the Mediterranean Sea to the Gulf of Suez at the city of Suez, Egypt, on Wednesday. Emilio Morenatti/AP hide caption

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Unrest In Egypt Spurs Worry Over Oil Supply
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BP To Resume Paying Dividends To Shareholders
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