Environment

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The charred remains of a tree stand in a swamp near Aliceville, Ala., on Wednesday, May 5, 2014. A train carrying nearly 3 million gallons of oil derailed and burned at the site in November 2013, resulting in the damage. Environmental regultors say cleanup and containment work is continuing, but critics contend the Alabama accident and others show the danger of transporting large amounts of oil in tanker trains. (AP Photo/Jay Reeves)

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Crude oil seeps into water in a swamp near Aliceville, Ala., on Wednesday, May 5, 2014. A train carrying nearly 3 million gallons of oil crashed at the site in November 2013, resulting in the pollution. Environmental regultors say cleanup and containment work is continuing, but critics contend the Alabama accident and others show the danger of transporting large amounts of oil in tanker trains. (AP Photo/Jay Reeves)

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A barrier meant to contain spilled crude oil stands partially submerged in a swamp near Aliceville, Ala., on Wednesday, May 5, 2014. A tanker train carrying nearly 3 million gallons of oil derailed and burned at the site in November 2013, resulting in the pollution. Environmental regultors say cleanup and containment work is continuing, but critics contend the Alabama accident and others show the danger of transporting large amounts of oil in tanker trains. (AP Photo/Jay Reeves)

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Material meant to contain spilled crude oil lines the side of a railroad bed in a swamp near Aliceville, Ala., on Wednesday, May 5, 2014. A train carrying nearly 3 million gallons of oil derailed and burned at the site in November 2013, resulting in the pollution. Environmental regultors say cleanup and containment work is continuing, but critics contend the Alabama accident and others show the danger of transporting large amounts of oil in tanker trains. (AP Photo/Jay Reeves)

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Crude oil seeps into water in an isolated wetland near Aliceville, Ala., on Wednesday, May 5, 2014. A train carrying nearly 3 million gallons of oil crashed at the site in November 2013, resulting in the pollution. Environmental regultors say cleanup and containment work is continuing, but critics contend the Alabama accident and others show the danger of transporting large amounts of oil in tanker trains. (AP Photo/Jay Reeves)

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A mixture of crude and weathered oil floats atop water in a swamp near Aliceville, Ala., on Wednesday, May 5, 2014. A train carrying nearly 3 million gallons of oil crashed at the site in November 2013, resulting in the pollution. Environmental regultors say cleanup and containment work is continuing, but critics contend the Alabama accident and others show the danger of transporting large amounts of oil in tanker trains. (AP Photo/Jay Reeves)

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Environmentalist John Wathen of Waterkeeper Alliance looks over a swamp near Aliceville, Ala., on Wednesday, May 5, 2014. A train carrying nearly 3 million gallons of oil crashed at the site in November 2013, polluting the site. Environmental regultors and the railroad say cleanup and containment work is continuing, but critics contend the Alabama accident and others show the danger of transporting large amounts of oil in tanker trains. (AP Photo/Jay Reeves)

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John Wathen, an environmentalist with the Waterkeeper Alliance, gestures at the site of a train derailment and oil spill near Aliceville, Ala., on Wednesday, May 5, 2014. Environmental regultors say cleanup and containment work is continuing at the site, but critics contend the accident and others show the danger of transporting large amounts of oil in tanker trains. (AP Photo/Jay Reeves)